partial.lenses - npm Package Compare versions

Comparing version 0.5.1 to 0.6.0

lib/partial.lenses.js

 "use strict";
 
-var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol ? "symbol" : typeof obj; };
-
 Object.defineProperty(exports, "__esModule", {
@@ -10,2 +8,4 @@ value: true
 
+var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol ? "symbol" : typeof obj; };
+
 var _ramda = require("ramda");
@@ -60,6 +60,9 @@
 
-var conserve = function conserve(f) {
-  return function (n0, o) {
-    var n = f(n0, o);
-    return _ramda2.default.equals(n, o) ? o : n;
+var conserve = function conserve(c0, c1) {
+  return _ramda2.default.equals(c0, c1) ? c0 : c1;
+};
+
+var toConserve = function toConserve(f) {
+  return function (y, c0) {
+    return conserve(c0, f(y, c0));
   };
@@ -104,26 +107,9 @@ };
 
-L.firstOf = function (l0) {
-  for (var _len2 = arguments.length, ls = Array(_len2 > 1 ? _len2 - 1 : 0), _key2 = 1; _key2 < _len2; _key2++) {
-    ls[_key2 - 1] = arguments[_key2];
-  }
-
-  l0 = lift(l0);
-
-  if (ls.length === 0) return l0;
-
+L.choose = function (x2yL) {
   return function (toFunctor) {
     return function (target) {
-      var l = l0;
-      var r = _ramda2.default.view(l0, target);
-
-      for (var i = 0; undefined === r && i < ls.length; ++i) {
-        l = lift(ls[i]);
-        r = _ramda2.default.view(l, target);
-      }
-
-      if (undefined === r) l = l0;
-
+      var l = lift(x2yL(target));
       return _ramda2.default.map(function (focus) {
         return _ramda2.default.set(l, focus, target);
-      }, toFunctor(r));
+      }, toFunctor(_ramda2.default.view(l, target)));
     };
@@ -133,6 +119,19 @@ };
 
+L.firstOf = function (l) {
+  for (var _len2 = arguments.length, ls = Array(_len2 > 1 ? _len2 - 1 : 0), _key2 = 1; _key2 < _len2; _key2++) {
+    ls[_key2 - 1] = arguments[_key2];
+  }
+
+  return L.choose(function (x) {
+    var lls = [l].concat(ls);
+    return lls[Math.max(0, lls.findIndex(function (l) {
+      return L.view(l, x) !== undefined;
+    }))];
+  });
+};
+
 L.replace = _ramda2.default.curry(function (inn, out) {
   return _ramda2.default.lens(function (x) {
     return _ramda2.default.equals(x, inn) ? out : x;
-  }, conserve(function (y) {
+  }, toConserve(function (y) {
     return _ramda2.default.equals(y, out) ? inn : y;
@@ -151,3 +150,3 @@ }));
 L.normalize = function (transform) {
-  return _ramda2.default.lens(toPartial(transform), conserve(toPartial(transform)));
+  return _ramda2.default.lens(toPartial(transform), toConserve(toPartial(transform)));
 };
@@ -164,17 +163,7 @@
 L.find = function (predicate) {
-  return _ramda2.default.lens(function (xs) {
-    return xs && xs.find(predicate);
-  }, function (x, xs) {
-    if (x === undefined) {
-      if (xs === undefined) return undefined;
-      var i = xs.findIndex(predicate);
-      if (i < 0) return xs;
-      return dropped(xs.slice(0, i).concat(xs.slice(i + 1)));
-    } else {
-      if (xs === undefined) return [x];
-      var i = xs.findIndex(predicate);
-      if (i < 0) return xs.concat([x]);
-      if (_ramda2.default.equals(x, xs[i])) return xs;
-      return xs.slice(0, i).concat([x], xs.slice(i + 1));
-    }
+  return L.choose(function (xs) {
+    if (xs === undefined) return L.append;
+    var i = xs.findIndex(predicate);
+    if (i < 0) return L.append;
+    return L.index(i);
   });
@@ -200,3 +189,19 @@ };
 
+L.append = _ramda2.default.lens(function () {}, function (x, xs) {
+  if (x === undefined) {
+    return xs;
+  } else {
+    if (xs === undefined) return [x];else return xs.concat([x]);
+  }
+});
+
+L.filter = function (p) {
+  return _ramda2.default.lens(function (xs) {
+    return xs && xs.filter(p);
+  }, function (ys, xs) {
+    return conserve(xs, dropped(_ramda2.default.concat(ys || [], (xs || []).filter(_ramda2.default.complement(p)))));
+  });
+};
+
 exports.default = L;
-//# 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rtial.lenses.js","sourcesContent":["import R from \"ramda\"\n\n//\n\nconst deleteKey = (k, o) => {\n  if (o === undefined || !(k in o))\n    return o\n  let r\n  for (const p in o) {\n    if (p !== k) {\n      if (undefined === r)\n        r = {}\n      r[p] = o[p]\n    }\n  }\n  return r\n}\n\nconst setKey = (k, v, o) => {\n  if (o === undefined)\n    return {[k]: v}\n  if (k in o && R.equals(v, o[k]))\n    return o\n  const r = {[k]: v}\n  for (const p in o)\n    if (p !== k)\n      r[p] = o[p]\n  return r\n}\n\n//\n\nconst dropped = xs => Object.keys(xs).length === 0 ? undefined : xs\n\n//\n\nconst toPartial = transform => x => undefined === x ? x : transform(x)\n\n//\n\nconst conserve = f => (n0, o) => {\n  const n = f(n0, o)\n  return R.equals(n, o) ? o : n\n}\n\n//\n\nexport const lift = l => {\n  switch (typeof l) {\n  case \"string\": return L.prop(l)\n  case \"number\": return L.index(l)\n  default:       return l\n  }\n}\n\nconst L = (l, ...ls) =>\n  ls.length === 0 ? lift(l) : R.compose(lift(l), ...ls.map(lift))\n\nL.compose = L\nL.delete = R.curry((l, s) => R.set(lift(l), undefined, s))\nL.lens = R.lens\nL.over = R.curry((l, x2x, s) => R.over(lift(l), x2x, s))\nL.set = R.curry((l, x, s) => R.set(lift(l), x, s))\nL.view = R.curry((l, s) => R.view(lift(l), s))\n\nL.firstOf = (l0, ...ls) => {\n  l0 = lift(l0)\n\n  if (ls.length === 0)\n    return l0\n\n  return toFunctor => target => {\n    let l = l0\n    let r = R.view(l0, target)\n\n    for (let i=0; undefined === r && i<ls.length; ++i) {\n      l = lift(ls[i])\n      r = R.view(l, target)\n    }\n\n    if (undefined === r)\n      l = l0\n\n    return R.map(focus => R.set(l, focus, target), toFunctor(r))\n  }\n}\n\nL.replace = R.curry((inn, out) =>\n  R.lens(x => R.equals(x, inn) ? out : x,\n         conserve(y => R.equals(y, out) ? inn : y)))\n\nL.default = L.replace(undefined)\nL.required = inn => L.replace(inn, undefined)\nL.define = v => R.compose(L.required(v), L.default(v))\n\nL.normalize = transform =>\n  R.lens(toPartial(transform), conserve(toPartial(transform)))\n\nL.prop = k =>\n  R.lens(o => o && o[k],\n         (v, o) => v === undefined ? deleteKey(k, o) : setKey(k, v, o))\n\nL.find = predicate => R.lens(xs => xs && xs.find(predicate), (x, xs) => {\n  if (x === undefined) {\n    if (xs === undefined)\n      return undefined\n    const i = xs.findIndex(predicate)\n    if (i < 0)\n      return xs\n    return dropped(xs.slice(0, i).concat(xs.slice(i+1)))\n  } else {\n    if (xs === undefined)\n      return [x]\n    const i = xs.findIndex(predicate)\n    if (i < 0)\n      return xs.concat([x])\n    if (R.equals(x, xs[i]))\n      return xs\n    return xs.slice(0, i).concat([x], xs.slice(i+1))\n  }\n})\n\nL.index = i => R.lens(xs => xs && xs[i], (x, xs) => {\n  if (x === undefined) {\n    if (xs === undefined)\n      return undefined\n    if (i < xs.length)\n      return dropped(xs.slice(0, i).concat(xs.slice(i+1)))\n    return xs\n  } else {\n    if (xs === undefined)\n      return Array(i).concat([x])\n    if (xs.length <= i)\n      return xs.concat(Array(i - xs.length), [x])\n    if (R.equals(x, xs[i]))\n      return xs\n    return xs.slice(0, i).concat([x], xs.slice(i+1))\n  }\n})\n\nexport default L\n"]}
+//# 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R from \"ramda\"\n\n//\n\nconst deleteKey = (k, o) => {\n  if (o === undefined || !(k in o))\n    return o\n  let r\n  for (const p in o) {\n    if (p !== k) {\n      if (undefined === r)\n        r = {}\n      r[p] = o[p]\n    }\n  }\n  return r\n}\n\nconst setKey = (k, v, o) => {\n  if (o === undefined)\n    return {[k]: v}\n  if (k in o && R.equals(v, o[k]))\n    return o\n  const r = {[k]: v}\n  for (const p in o)\n    if (p !== k)\n      r[p] = o[p]\n  return r\n}\n\n//\n\nconst dropped = xs => Object.keys(xs).length === 0 ? undefined : xs\n\n//\n\nconst toPartial = transform => x => undefined === x ? x : transform(x)\n\n//\n\nconst conserve = (c0, c1) => R.equals(c0, c1) ? c0 : c1\n\nconst toConserve = f => (y, c0) =>  conserve(c0, f(y, c0))\n\n//\n\nexport const lift = l => {\n  switch (typeof l) {\n  case \"string\": return L.prop(l)\n  case \"number\": return L.index(l)\n  default:       return l\n  }\n}\n\nconst L = (l, ...ls) =>\n  ls.length === 0 ? lift(l) : R.compose(lift(l), ...ls.map(lift))\n\nL.compose = L\nL.delete = R.curry((l, s) => R.set(lift(l), undefined, s))\nL.lens = R.lens\nL.over = R.curry((l, x2x, s) => R.over(lift(l), x2x, s))\nL.set = R.curry((l, x, s) => R.set(lift(l), x, s))\nL.view = R.curry((l, s) => R.view(lift(l), s))\n\nL.choose = x2yL => toFunctor => target => {\n  const l = lift(x2yL(target))\n  return R.map(focus => R.set(l, focus, target), toFunctor(R.view(l, target)))\n}\n\nL.firstOf = (l, ...ls) => L.choose(x => {\n  const lls = [l, ...ls]\n  return lls[Math.max(0, lls.findIndex(l => L.view(l, x) !== undefined))]\n})\n\nL.replace = R.curry((inn, out) =>\n  R.lens(x => R.equals(x, inn) ? out : x,\n         toConserve(y => R.equals(y, out) ? inn : y)))\n\nL.default = L.replace(undefined)\nL.required = inn => L.replace(inn, undefined)\nL.define = v => R.compose(L.required(v), L.default(v))\n\nL.normalize = transform =>\n  R.lens(toPartial(transform), toConserve(toPartial(transform)))\n\nL.prop = k =>\n  R.lens(o => o && o[k],\n         (v, o) => v === undefined ? deleteKey(k, o) : setKey(k, v, o))\n\nL.find = predicate => L.choose(xs => {\n  if (xs === undefined)\n    return L.append\n  const i = xs.findIndex(predicate)\n  if (i < 0)\n    return L.append\n  return L.index(i)\n})\n\nL.index = i => R.lens(xs => xs && xs[i], (x, xs) => {\n  if (x === undefined) {\n    if (xs === undefined)\n      return undefined\n    if (i < xs.length)\n      return dropped(xs.slice(0, i).concat(xs.slice(i+1)))\n    return xs\n  } else {\n    if (xs === undefined)\n      return Array(i).concat([x])\n    if (xs.length <= i)\n      return xs.concat(Array(i - xs.length), [x])\n    if (R.equals(x, xs[i]))\n      return xs\n    return xs.slice(0, i).concat([x], xs.slice(i+1))\n  }\n})\n\nL.append = R.lens(() => {}, (x, xs) => {\n  if (x === undefined) {\n    return xs\n  } else {\n    if (xs === undefined)\n      return [x]\n    else\n      return xs.concat([x])\n  }\n})\n\nL.filter = p => R.lens(xs => xs && xs.filter(p), (ys, xs) =>\n  conserve(xs, dropped(R.concat(ys || [], (xs || []).filter(R.complement(p))))))\n\nexport default L\n"]}

package.json

 {
   "name": "partial.lenses",
-  "version": "0.5.1",
+  "version": "0.6.0",
   "description": "Ramda compatible lenses",
@@ -14,3 +14,3 @@ "main": "lib/partial.lenses.js",
     "type": "git",
-    "url": "git+https://github.com/polytypic/partial.lenses.git"
+    "url": "git+https://github.com/dirty-js/partial.lenses.git"
   },
@@ -25,5 +25,5 @@ "keywords": [
   "bugs": {
-    "url": "https://github.com/polytypic/partial.lenses/issues"
+    "url": "https://github.com/dirty-js/partial.lenses/issues"
   },
-  "homepage": "https://github.com/polytypic/partial.lenses#readme",
+  "homepage": "https://github.com/dirty-js/partial.lenses#readme",
   "dependencies": {
@@ -33,11 +33,11 @@ "ramda": "^0.19.1"
   "devDependencies": {
-    "babel": "^6.3.13",
-    "babel-cli": "^6.3.17",
-    "babel-eslint": "^4.1.6",
-    "babel-plugin-transform-es2015-modules-commonjs": "^6.3.16",
-    "babel-preset-es2015": "^6.3.13",
-    "babel-preset-stage-2": "^6.3.13",
-    "eslint": "^1.10.3",
-    "mocha": "^2.4.4"
+    "babel": "^6.5.2",
+    "babel-cli": "^6.5.1",
+    "babel-eslint": "^4.1.8",
+    "babel-plugin-transform-es2015-modules-commonjs": "^6.5.2",
+    "babel-preset-es2015": "^6.5.0",
+    "babel-preset-stage-2": "^6.5.0",
+    "eslint": "^2.0.0",
+    "mocha": "^2.4.5"
   }
 }

README.md

@@ -6,9 +6,11 @@ [ [Examples](#examples) | [Reference](#reference) | [Background](#background) ]
 existing part of a data structure, a partial lens can *view* optional data,
-*insert* new data, *update* existing data and *delete* existing data.
+*insert* new data, *update* existing data and *delete* existing data and can
+provide *default* values and maintain *required* data structure parts.
 
-In Javascript, optional data can be mapped to `undefined`, which is what partial
-lenses also do.  When the viewed part of a data structure is missing, the result
-is `undefined`.  When a part of a data structure is set to `undefined`, the part
-is deleted.  Partial lenses are defined in such a way that operations compose
-and one can conveniently and robustly operate on deeply nested data structures.
+In Javascript, missing data can be mapped to `undefined`, which is what partial
+lenses also do.  When a part of a data structure is missing, an attempt to view
+it returns `undefined`.  When a part is missing, setting it to a defined value
+inserts the new part.  Setting an existing part to `undefined` deletes it.
+Partial lenses are defined in such a way that operations compose and one can
+conveniently and robustly operate on deeply nested data structures.
 
@@ -30,9 +32,9 @@ [![npm version](https://badge.fury.io/js/partial.lenses.svg)](http://badge.fury.io/js/partial.lenses)
 const textIn = language =>
-  L("contents",
-    L.required([]),
-    L.normalize(R.sortBy(R.prop("language"))),
-    L.find(c => c.language === language),
-    L.default({language}),
-    "text",
-    L.default(""))
+  L.compose(L.prop("contents"),
+            L.required([]),
+            L.normalize(R.sortBy(R.prop("language"))),
+            L.find(R.whereEq({language})),
+            L.default({language}),
+            L.prop("text"),
+            L.default(""))
 ```
@@ -104,2 +106,8 @@
 
+For clarity, the code snippets in this section avoided some of the shorthands
+that this library supports.  In particular,
+* `L.compose(...)` can be abbreviated as `L(...)`,
+* `L.prop(string)` can be abbreviated as `string`, and
+* `L.set(l, undefined, s)` can be abbreviated as `L.delete(l, s)`.
+
 ## Reference
@@ -119,4 +127,4 @@
 
-* `L(l0, ...ls)` and `L.compose(l0, ...ls)` both are the same as
-  `R.compose(lift(l0), ...ls.map(lift))` (see
+* `L(l, ...ls)` and `L.compose(l, ...ls)` both are the same as
+  `R.compose(lift(l), ...ls.map(lift))` (see
   [compose](http://ramdajs.com/0.19.0/docs/#compose)).
@@ -132,2 +140,4 @@ * `L.lens(get, set)` is the same as `R.lens(get, set)` (see
 
+#### Lifting
+
 The idempotent `lift` operation is defined as
@@ -145,3 +155,4 @@
 
-and is available as a non-default export.
+and is available as a non-default export.  All operations in this library that
+take lenses as arguments implicitly lift them.
 
@@ -154,24 +165,51 @@ #### L.delete(l, s)
 
-#### L.firstOf(l0, ...ls)
+### Lenses
 
-`L.firstOf(l0, ...ls)` returns a partial lens that acts like the first of the
-given lenses, `l0, ...ls`, whose view is not undefined on the given target.
-When the views of all of the given lenses are undefined, the returned lens acts
-like `l0`.
+In alphabetical order.
 
-Note that `L.firstOf` is an associative operation, but there is no identity
-element.
+#### L.append
 
-### Lenses
+`L.append` is a special lens that operates on arrays.  The view of `L.append` is
+always undefined.  Setting `L.append` to undefined has no effect by itself.
+Setting `L.append` to a defined value appends the value to the end of the
+focused array.
 
-#### L.prop(string)
+#### L.choose(maybeValue => PartialLens)
 
-`L.prop(string)` or `L(string)` is similar to `R.lensProp(string)` (see
-[lensProp](http://ramdajs.com/0.19.0/docs/#lensProp)), but acts as a partial
-lens:
-* When viewing an undefined property or an undefined object, the result is
-  undefined.
-* When setting property to undefined, the property is removed from the result.
-  If the result would be an empty object, the whole result will be undefined.
+`L.choose(maybeValue => PartialLens)` creates a lens whose operation is
+determined by the given function that maps the underlying view, which can be
+undefined, to a lens.
 
+#### L.filter(predicate)
+
+`L.filter(predicate)` operates on arrays.  When viewed, only elements matching
+the given predicate will be returned.  When set, the resulting array will be
+formed by concatenating the set array and the complement of the filtered
+context.  If the resulting array would be empty, the whole result will be
+undefined.
+
+*Note:* An alternative design for filter could implement a smarter algorithm to
+combine arrays when set.  For example, an algorithm based on
+[edit distance](https://en.wikipedia.org/wiki/Edit_distance) could be used to
+maintain relative order of elements.  While this would not be difficult to
+implement, it doesn't seem to make sense, because in most cases use of
+`normalize` would be preferable.
+
+#### L.find(value => boolean)
+
+`L.find(value => boolean)` operates on arrays like `L.index`, but the index to
+be viewed is determined by finding the first element from the input array that
+matches the given predicate.  When no matching element is found the effect is
+same as with `L.append`.
+
+#### L.firstOf(l, ...ls)
+
+`L.firstOf(l, ...ls)` returns a partial lens that acts like the first of the
+given lenses, `l, ...ls`, whose view is not undefined on the given target.  When
+the views of all of the given lenses are undefined, the returned lens acts like
+`l`.
+
+Note that `L.firstOf` is an associative operation, but there is no identity
+element.
+
 #### L.index(integer)
@@ -189,13 +227,6 @@
 
-#### L.find(predicate)
+#### L.normalize(value => value)
 
-`L.find(predicate)` operates on arrays like `L.index`, but the index to be
-viewed is determined by finding the first element from the input array that
-matches the given unary predicate.  When no matching element is found the effect
-is same as with `R.index` with the index set to the length of the array.
-
-#### L.normalize(transform)
-
-`L.normalize(transform)` maps the value with same given `transform` when viewed
-and set and implicitly maps undefined to undefined.  More specifically,
+`L.normalize(value => value)` maps the value with same given transform when
+viewed and set and implicitly maps undefined to undefined.  More specifically,
 `L.normalize(transform)` is equivalent to `R.lens(toPartial(transform),
@@ -208,6 +239,16 @@ toPartial(transform))` where
 
-The use case for `normalize` is to make it easy to determine whether, after a
-change, the data has actually changed.  By keeping the data normalized, a simple
-`R.equals` comparison will do.
+The main use case for `normalize` is to make it easy to determine whether, after
+a change, the data has actually changed.  By keeping the data normalized, a
+simple `R.equals` comparison will do.
 
+#### L.prop(string)
+
+`L.prop(string)` or `L(string)` is similar to `R.lensProp(string)` (see
+[lensProp](http://ramdajs.com/0.19.0/docs/#lensProp)), but acts as a partial
+lens:
+* When viewing an undefined property or an undefined object, the result is
+  undefined.
+* When setting property to undefined, the property is removed from the result.
+  If the result would be an empty object, the whole result will be undefined.
+
 #### L.replace(inn, out)
@@ -219,5 +260,5 @@
 
-The use case for `replace` is to handle optional and required properties and
-elements.  In most cases, rather than using `replace`, you will make selective
-use of `required` and `default`:
+The main use case for `replace` is to handle optional and required properties
+and elements.  In most cases, rather than using `replace`, you will make
+selective use of `default` and `required`:
 
@@ -228,2 +269,6 @@ ##### L.default(out)
 
+##### L.define(value)
+
+`L.define(value)` is the same as `L(L.required(value), L.default(value))`.
+
 ##### L.required(inn)
@@ -233,6 +278,2 @@
 
-##### L.define(value)
-
-`L.define(value)` is the same as `L(L.required(value), L.default(value))`.
-
 ## Background
@@ -239,0 +280,0 @@

src/partial.lenses.js

@@ -41,7 +41,6 @@ import R from "ramda"
 
-const conserve = f => (n0, o) => {
-  const n = f(n0, o)
-  return R.equals(n, o) ? o : n
-}
+const conserve = (c0, c1) => R.equals(c0, c1) ? c0 : c1
 
+const toConserve = f => (y, c0) =>  conserve(c0, f(y, c0))
+
 //
@@ -67,27 +66,15 @@
 
-L.firstOf = (l0, ...ls) => {
-  l0 = lift(l0)
+L.choose = x2yL => toFunctor => target => {
+  const l = lift(x2yL(target))
+  return R.map(focus => R.set(l, focus, target), toFunctor(R.view(l, target)))
+}
 
-  if (ls.length === 0)
-    return l0
+L.firstOf = (l, ...ls) => L.choose(x => {
+  const lls = [l, ...ls]
+  return lls[Math.max(0, lls.findIndex(l => L.view(l, x) !== undefined))]
+})
 
-  return toFunctor => target => {
-    let l = l0
-    let r = R.view(l0, target)
-
-    for (let i=0; undefined === r && i<ls.length; ++i) {
-      l = lift(ls[i])
-      r = R.view(l, target)
-    }
-
-    if (undefined === r)
-      l = l0
-
-    return R.map(focus => R.set(l, focus, target), toFunctor(r))
-  }
-}
-
 L.replace = R.curry((inn, out) =>
   R.lens(x => R.equals(x, inn) ? out : x,
-         conserve(y => R.equals(y, out) ? inn : y)))
+         toConserve(y => R.equals(y, out) ? inn : y)))
 
@@ -99,3 +86,3 @@ L.default = L.replace(undefined)
 L.normalize = transform =>
-  R.lens(toPartial(transform), conserve(toPartial(transform)))
+  R.lens(toPartial(transform), toConserve(toPartial(transform)))
 
@@ -106,20 +93,9 @@ L.prop = k =>
 
-L.find = predicate => R.lens(xs => xs && xs.find(predicate), (x, xs) => {
-  if (x === undefined) {
-    if (xs === undefined)
-      return undefined
-    const i = xs.findIndex(predicate)
-    if (i < 0)
-      return xs
-    return dropped(xs.slice(0, i).concat(xs.slice(i+1)))
-  } else {
-    if (xs === undefined)
-      return [x]
-    const i = xs.findIndex(predicate)
-    if (i < 0)
-      return xs.concat([x])
-    if (R.equals(x, xs[i]))
-      return xs
-    return xs.slice(0, i).concat([x], xs.slice(i+1))
-  }
+L.find = predicate => L.choose(xs => {
+  if (xs === undefined)
+    return L.append
+  const i = xs.findIndex(predicate)
+  if (i < 0)
+    return L.append
+  return L.index(i)
 })
@@ -145,2 +121,16 @@
 
+L.append = R.lens(() => {}, (x, xs) => {
+  if (x === undefined) {
+    return xs
+  } else {
+    if (xs === undefined)
+      return [x]
+    else
+      return xs.concat([x])
+  }
+})
+
+L.filter = p => R.lens(xs => xs && xs.filter(p), (ys, xs) =>
+  conserve(xs, dropped(R.concat(ys || [], (xs || []).filter(R.complement(p))))))
+
 export default L

test/tests.js

@@ -15,4 +15,4 @@ import R from "ramda"
 
-const testEq = (expr, fn, expect) => it(`${expr} => ${show(expect)}`, () => {
-  const actual = fn()
+const testEq = (expr, expect) => it(`${expr} => ${show(expect)}`, () => {
+  const actual = eval(`(L, R) => ${expr}`)(L, R)
   if (!R.equals(actual, expect))
@@ -23,135 +23,79 @@ throw new Error(`Expected: ${show(expect)}, actual: ${show(actual)}`)
 describe("arities", () => {
-  testEq('L.compose.length', () =>
-          L.compose.length, 1)
-  testEq('L.default.length', () =>
-          L.default.length, 1)
-  testEq('L.define.length', () =>
-          L.define.length, 1)
-  testEq('L.delete.length', () =>
-          L.delete.length, 2)
-  testEq('L.find.length', () =>
-          L.find.length, 1)
-  testEq('L.index.length', () =>
-          L.index.length, 1)
-  testEq('L.length', () =>
-          L.length, 1)
-  testEq('L.lens.length', () =>
-          L.lens.length, 2)
-  testEq('L.normalize.length', () =>
-          L.normalize.length, 1)
-  testEq('L.over.length', () =>
-          L.over.length, 3)
-  testEq('L.prop.length', () =>
-          L.prop.length, 1)
-  testEq('L.replace.length', () =>
-          L.replace.length, 2)
-  testEq('L.required.length', () =>
-          L.required.length, 1)
-  testEq('L.set.length', () =>
-          L.set.length, 3)
-  testEq('L.view.length', () =>
-          L.view.length, 2)
+  testEq('L.compose.length', 1)
+  testEq('L.default.length', 1)
+  testEq('L.define.length', 1)
+  testEq('L.delete.length', 2)
+  testEq('L.find.length', 1)
+  testEq('L.index.length', 1)
+  testEq('L.length', 1)
+  testEq('L.lens.length', 2)
+  testEq('L.normalize.length', 1)
+  testEq('L.over.length', 3)
+  testEq('L.prop.length', 1)
+  testEq('L.replace.length', 2)
+  testEq('L.required.length', 1)
+  testEq('L.set.length', 3)
+  testEq('L.view.length', 2)
 })
 
 describe('L.find', () => {
-  testEq('L.set(L.find(R.equals(2)), undefined, [,,2])', () =>
-          L.set(L.find(R.equals(2)), undefined, [,,2]), undefined)
-  testEq('L.set(L.find(R.equals(2)), undefined, [1, 2, 3])', () =>
-          L.set(L.find(R.equals(2)), undefined, [1, 2, 3]), [1, 3])
-  testEq('L.set(L.find(R.equals(2)), 4, [1, 2, 3])', () =>
-          L.set(L.find(R.equals(2)), 4, [1, 2, 3]), [1, 4, 3])
-  testEq('L.set(L.find(R.equals(2)), 2, [1, 4, 3])', () =>
-          L.set(L.find(R.equals(2)), 2, [1, 4, 3]), [1, 4, 3, 2])
-  testEq('L.set(L.find(R.equals(2)), 2, undefined)', () =>
-          L.set(L.find(R.equals(2)), 2, undefined), [2])
-  testEq('L.set(L.find(R.equals(2)), 2, [])', () =>
-          L.set(L.find(R.equals(2)), 2, []), [2])
-  testEq('L.view(L.find(R.equals(2)), undefined)', () =>
-          L.view(L.find(R.equals(2)), undefined), undefined)
-  testEq('L.view(L.find(R.equals(2)), [3])', () =>
-          L.view(L.find(R.equals(2)), [3]), undefined)
+  testEq('L.set(L.find(R.equals(2)), undefined, [,,2])', undefined)
+  testEq('L.set(L.find(R.equals(2)), undefined, [1, 2, 3])', [1, 3])
+  testEq('L.set(L.find(R.equals(2)), 4, [1, 2, 3])', [1, 4, 3])
+  testEq('L.set(L.find(R.equals(2)), 2, [1, 4, 3])', [1, 4, 3, 2])
+  testEq('L.set(L.find(R.equals(2)), 2, undefined)', [2])
+  testEq('L.set(L.find(R.equals(2)), 2, [])', [2])
+  testEq('L.view(L.find(R.equals(2)), undefined)', undefined)
+  testEq('L.view(L.find(R.equals(2)), [3])', undefined)
 })
 
 describe('L.index', () => {
-  testEq('L.set(L(1), undefined, [,,])', () =>
-          L.set(L(1), undefined, [,,]), undefined)
-  testEq('L.set(L.compose(L.required([]), 1), undefined, [,,])', () =>
-          L.set(L.compose(L.required([]), 1), undefined, [,,]), [])
-  testEq('L.set(L(1), 4, [1, 2, 3])', () =>
-          L.set(L(1), 4, [1, 2, 3]), [1, 4, 3])
-  testEq('L.set(2, 4, undefined)', () =>
-          L.set(2, 4, undefined), [,, 4])
-  testEq('L.set(L(2), 4, [1])', () =>
-          L.set(L(2), 4, [1]), [1,, 4])
-  testEq('L.delete(L(0), [1, 2, 3])', () =>
-          L.delete(L(0), [1, 2, 3]), [2, 3])
-  testEq('L.set(L(1), undefined, [1, 2, 3])', () =>
-          L.set(L(1), undefined, [1, 2, 3]), [1, 3])
-  testEq('L.set(2, undefined, [1, 2, 3])', () =>
-          L.set(2, undefined, [1, 2, 3]), [1, 2])
-  testEq('L.set(L(5), undefined, [1, 2, 3])', () =>
-          L.set(L(5), undefined, [1, 2, 3]), [1, 2, 3])
-  testEq('L.view(5, undefined)', () =>
-          L.view(5, undefined), undefined)
-  testEq('L.view(L(5), [1, 2, 3])', () =>
-          L.view(L(5), [1, 2, 3]), undefined)
+  testEq('L.set(L(1), undefined, [,,])', undefined)
+  testEq('L.set(L.compose(L.required([]), 1), undefined, [,,])', [])
+  testEq('L.set(L(1), 4, [1, 2, 3])', [1, 4, 3])
+  testEq('L.set(2, 4, undefined)', [,, 4])
+  testEq('L.set(L(2), 4, [1])', [1,, 4])
+  testEq('L.delete(L(0), [1, 2, 3])', [2, 3])
+  testEq('L.set(L(1), undefined, [1, 2, 3])', [1, 3])
+  testEq('L.set(2, undefined, [1, 2, 3])', [1, 2])
+  testEq('L.set(L(5), undefined, [1, 2, 3])', [1, 2, 3])
+  testEq('L.view(5, undefined)', undefined)
+  testEq('L.view(L(5), [1, 2, 3])', undefined)
 })
 
 describe('L.prop', () => {
-  testEq('L.set(L("x"), undefined, {x: 1})', () =>
-          L.set(L("x"), undefined, {x: 1}), undefined)
-  testEq('L.set(L("x", L.required(null)), undefined, {x: 1})', () =>
-          L.set(L("x", L.required(null)), undefined, {x: 1}), {x: null})
-  testEq('L.set(L.compose("x", L.required(null)), 2, {x: 1})', () =>
-          L.set(L.compose("x", L.required(null)), 2, {x: 1}), {x: 2})
-  testEq('L.delete("y", {x: 1, y: 2})', () =>
-          L.delete("y", {x: 1, y: 2}), {x: 1})
-  testEq('L.set(L("y"), 3, {x: 1, y: 2})', () =>
-          L.set(L("y"), 3, {x: 1, y: 2}), {x: 1, y: 3})
-  testEq('L.set("z", 3, {x: 1, y: 2})', () =>
-          L.set("z", 3, {x: 1, y: 2}), {x: 1, y: 2, z: 3})
-  testEq('L.set(L("z"), 3, undefined)', () =>
-          L.set(L("z"), 3, undefined), {z: 3})
-  testEq('L.view("z", undefined)', () =>
-          L.view("z", undefined), undefined)
-  testEq('L.view(L("z"), {x: 1})', () =>
-          L.view(L("z"), {x: 1}), undefined)
+  testEq('L.set(L("x"), undefined, {x: 1})', undefined)
+  testEq('L.set(L("x", L.required(null)), undefined, {x: 1})', {x: null})
+  testEq('L.set(L.compose("x", L.required(null)), 2, {x: 1})', {x: 2})
+  testEq('L.delete("y", {x: 1, y: 2})', {x: 1})
+  testEq('L.set(L("y"), 3, {x: 1, y: 2})', {x: 1, y: 3})
+  testEq('L.set("z", 3, {x: 1, y: 2})', {x: 1, y: 2, z: 3})
+  testEq('L.set(L("z"), 3, undefined)', {z: 3})
+  testEq('L.view("z", undefined)', undefined)
+  testEq('L.view(L("z"), {x: 1})', undefined)
 })
 
 describe("L.replace", () => {
-  testEq('L.view(L.replace(undefined, ""), undefined)', () =>
-          L.view(L.replace(undefined, ""), undefined), "")
-  testEq('L.view(L.replace(undefined, ""), "defined")', () =>
-          L.view(L.replace(undefined, ""), "defined"), "defined")
-  testEq('L.set(L.replace(undefined, ""), "", "anything")', () =>
-          L.set(L.replace(undefined, ""), "", "anything"), undefined)
-  testEq('L.set(L.replace(undefined, ""), "defined", "anything")', () =>
-          L.set(L.replace(undefined, ""), "defined", "anything"), "defined")
+  testEq('L.view(L.replace(undefined, ""), undefined)', "")
+  testEq('L.view(L.replace(undefined, ""), "defined")', "defined")
+  testEq('L.set(L.replace(undefined, ""), "", "anything")', undefined)
+  testEq('L.set(L.replace(undefined, ""), "defined", "anything")', "defined")
 })
 
 describe("L.default", () => {
-  testEq('L.view(L.default(""), undefined)', () =>
-          L.view(L.default(""), undefined), "")
-  testEq('L.view(L.default(""), "defined")', () =>
-          L.view(L.default(""), "defined"), "defined")
-  testEq('L.set(L.default(""), "", "anything")', () =>
-          L.set(L.default(""), "", "anything"), undefined)
-  testEq('L.set(L.default(""), "defined", "anything")', () =>
-          L.set(L.default(""), "defined", "anything"), "defined")
+  testEq('L.view(L.default(""), undefined)', "")
+  testEq('L.view(L.default(""), "defined")', "defined")
+  testEq('L.set(L.default(""), "", "anything")', undefined)
+  testEq('L.set(L.default(""), "defined", "anything")', "defined")
 })
 
 describe("L.normalize", () => {
-  testEq('L.view(L.normalize(R.sortBy(R.identity)), [1,3,2,5])', () =>
-          L.view(L.normalize(R.sortBy(R.identity)), [1,3,2,5]), [1,2,3,5])
-  testEq('L.set(L(L.normalize(R.sortBy(R.identity)), L.find(R.equals(2))), 4, [1,3,2,5])', () =>
-          L.set(L(L.normalize(R.sortBy(R.identity)), L.find(R.equals(2))), 4, [1,3,2,5]),
+  testEq('L.view(L.normalize(R.sortBy(R.identity)), [1,3,2,5])', [1,2,3,5])
+  testEq('L.set(L(L.normalize(R.sortBy(R.identity)), L.find(R.equals(2))), 4, [1,3,2,5])',
          [1,3,4,5])
-  testEq('L.set(L(L.normalize(R.sortBy(R.identity)), L.find(R.equals(2))), 4, undefined)', () =>
-          L.set(L(L.normalize(R.sortBy(R.identity)), L.find(R.equals(2))), 4, undefined),
+  testEq('L.set(L(L.normalize(R.sortBy(R.identity)), L.find(R.equals(2))), 4, undefined)',
          [4])
-  testEq('L.delete(L(L.normalize(R.sortBy(R.identity)), L.find(R.equals(2))), [2])', () =>
-          L.delete(L(L.normalize(R.sortBy(R.identity)), L.find(R.equals(2))), [2]),
+  testEq('L.delete(L(L.normalize(R.sortBy(R.identity)), L.find(R.equals(2))), [2])',
          undefined)
-  testEq('L.set(L(L.normalize(R.sortBy(R.identity)), L.find(R.equals(2))), undefined, [1,3,2,5])', () =>
-          L.set(L(L.normalize(R.sortBy(R.identity)), L.find(R.equals(2))), undefined, [1,3,2,5]),
+  testEq('L.set(L(L.normalize(R.sortBy(R.identity)), L.find(R.equals(2))), undefined, [1,3,2,5])',
          [1,3,5])
@@ -161,22 +105,22 @@ })
 describe("L.firstOf", () => {
-  testEq('L.view(L.firstOf("x", "y"), {x: 11, y: 12})', () =>
-          L.view(L.firstOf("x", "y"), {x: 11, y: 12}), 11)
-  testEq('L.view(L.firstOf("y", "x"), {x: 11, y: 12})', () =>
-          L.view(L.firstOf("y", "x"), {x: 11, y: 12}), 12)
-  testEq('L.view(L.firstOf("x", "y"), {z: 13})', () =>
-          L.view(L.firstOf("x", "y"), {z: 13}), undefined)
-  testEq('L.over(L.firstOf("x", "y"), x => x-2, {x: 11, y: 12})', () =>
-          L.over(L.firstOf("x", "y"), x => x-2, {x: 11, y: 12}), {x: 9, y: 12})
-  testEq('L.over(L.firstOf("y", "x"), x => x-2, {x: 11, y: 12})', () =>
-          L.over(L.firstOf("y", "x"), x => x-2, {x: 11, y: 12}), {x: 11, y: 10})
-  testEq('L.set(L.firstOf("x", "y"), 12, {z: 13})', () =>
-          L.set(L.firstOf("x", "y"), 12, {z: 13}), {x: 12, z: 13})
-  testEq('L.set(L.firstOf("y", "x"), 12, {z: 13})', () =>
-          L.set(L.firstOf("y", "x"), 12, {z: 13}), {y: 12, z: 13})
-  testEq('L.delete(L.firstOf("x", "y"), {z: 13})', () =>
-          L.delete(L.firstOf("x", "y"), {z: 13}), {z: 13})
-  testEq('L.delete(L.firstOf("x", "y"), {x: 11, y: 12})', () =>
-          L.delete(L.firstOf("x", "y"), {x: 11, y: 12}), {y: 12})
-  testEq('L.delete(L.firstOf("y", "x"), {x: 11, y: 12})', () =>
-          L.delete(L.firstOf("y", "x"), {x: 11, y: 12}), {x: 11})
+  testEq('L.view(L.firstOf("x", "y"), {x: 11, y: 12})', 11)
+  testEq('L.view(L.firstOf("y", "x"), {x: 11, y: 12})', 12)
+  testEq('L.view(L.firstOf("x", "y"), {z: 13})', undefined)
+  testEq('L.over(L.firstOf("x", "y"), x => x-2, {x: 11, y: 12})', {x: 9, y: 12})
+  testEq('L.over(L.firstOf("y", "x"), x => x-2, {x: 11, y: 12})', {x: 11, y: 10})
+  testEq('L.set(L.firstOf("x", "y"), 12, {z: 13})', {x: 12, z: 13})
+  testEq('L.set(L.firstOf("y", "x"), 12, {z: 13})', {y: 12, z: 13})
+  testEq('L.delete(L.firstOf("x", "y"), {z: 13})', {z: 13})
+  testEq('L.delete(L.firstOf("x", "y"), {x: 11, y: 12})', {y: 12})
+  testEq('L.delete(L.firstOf("y", "x"), {x: 11, y: 12})', {x: 11})
 })
+
+describe("L.filter", () => {
+  testEq('L.view(L.filter(R.lt(9)), [3,1,4,1,5,9,2])', [])
+  testEq('L.view(L.filter(R.lt(2)), undefined)', undefined)
+  testEq('L.view(L.filter(R.lt(2)), [3,1,4,1,5,9,2])', [3,4,5,9])
+  testEq('L.delete(L(L.filter(R.lt(2)), 1), [3,1,4,1,5,9,2])', [3,5,9,1,1,2])
+  testEq('L.set(L.filter(R.lt(0)), [], [3,1,4,1,5,9,2])', undefined)
+  testEq('L.delete(L.filter(R.lt(0)), [3,1,4,1,5,9,2])', undefined)
+  testEq('L.delete(L.filter(R.lt(2)), [3,1,4,1,5,9,2])', [1,1,2])
+})

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Uses eval

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Fixed alerts

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Improved metrics

Number of lines in readme file

321

increased by14.64%

Worsened metrics

Total package byte prevSize

46056

decreased by-0.01%

Lines of code

382

decreased by-13.57%

Number of medium supply chain risk alerts

2

increased byInfinity%

No dependency changes