partial.lenses - npm Package Compare versions

Comparing version 0.1.1 to 0.2.0

lib/partial.lenses.js

@@ -23,6 +23,10 @@ "use strict";
   if (o === undefined || !(k in o)) return o;
-  var r = {};
+  var r = undefined;
   for (var p in o) {
-    if (p !== k) r[p] = o[p];
-  }return r;
+    if (p !== k) {
+      if (undefined === r) r = {};
+      r[p] = o[p];
+    }
+  }
+  return r;
 };
@@ -41,2 +45,8 @@
 
+var dropped = function dropped(xs) {
+  return Object.keys(xs).length === 0 ? undefined : xs;
+};
+
+//
+
 var conserve = function conserve(f) {
@@ -99,3 +109,3 @@ return function (n0, o) {
       if (i < 0) return xs;
-      return xs.slice(0, i).concat(xs.slice(i + 1));
+      return dropped(xs.slice(0, i).concat(xs.slice(i + 1)));
     } else {
@@ -117,3 +127,3 @@ if (xs === undefined) return [x];
       if (xs === undefined) return undefined;
-      if (i < xs.length) return xs.slice(0, i).concat(xs.slice(i + 1));
+      if (i < xs.length) return dropped(xs.slice(0, i).concat(xs.slice(i + 1)));
       return xs;
@@ -130,2 +140,2 @@ } else {
 exports.default = L;
-//# sourceMappingURL=data:application/json;base64,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+//# 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package.json

 {
   "name": "partial.lenses",
-  "version": "0.1.1",
+  "version": "0.2.0",
   "description": "Ramda compatible lenses",
@@ -5,0 +5,0 @@ "main": "lib/partial.lenses.js",

README.md

 [![npm version](https://badge.fury.io/js/partial.lenses.svg)](http://badge.fury.io/js/partial.lenses)
 
-This library provides a collection of Ramda compatible partial (dealing with
-`undefined` results) lenses.
+This library provides a collection of [Ramda](http://ramdajs.com/) compatible
+partial (dealing with `undefined` results) lenses.  The intention is to make
+modification or editing of JSON data convenient and *compositional*.
+
+## Motivation
+
+Consider the following REPL session using Ramda 0.19.1:
+
+```js
+> R.set(R.lensPath(["x", "y"]), 1, {})
+{ x: { y: 1 } }
+> R.set(R.compose(R.lensProp("x"), R.lensProp("y")), 1, {})
+TypeError: Cannot read property 'y' of undefined
+> R.view(R.lensPath(["x", "y"]), {})
+undefined
+> R.view(R.compose(R.lensProp("x"), R.lensProp("y")), {})
+TypeError: Cannot read property 'y' of undefined
+> R.set(R.lensPath(["x", "y"]), undefined, {x: {y: 1}})
+{ x: { y: undefined } }
+> R.set(R.compose(R.lensProp("x"), R.lensProp("y")), undefined, {x: {y: 1}})
+{ x: { y: undefined } }
+```
+
+One might assume that `R.lensPath([p1, ..., pN])` is equivalent to
+`R.compose(R.lensProp(p1), ..., R.lensProp(pN))`, but that is not the case.
+
+## Usage
+
+The lenses and operations on lenses are accessed via the default import:
+
+```js
+import L from "partial.lenses"
+```
+
+## Operations on lenses
+
+For convenience, you can access basic operations on lenses via the default
+import `L`:
+
+* `L.lens(get, set)` is the same as `R.lens(get, set)` (see [lens](http://ramdajs.com/0.19.0/docs/#lens)).
+* `L.over(lens, x2x, s)` is the same as `R.over(lens, x2x, s)` (see [over](http://ramdajs.com/0.19.0/docs/#over)).
+* `L.set(lens, x, s)` is the same as `R.set(lens, x, s)` (see [set](http://ramdajs.com/0.19.0/docs/#set)).
+* `L.view(lens, s)` is the same as `R.view(lens, s)` (see [view](http://ramdajs.com/0.19.0/docs/#view)).
+
+## Shorthand composition and lifting
+
+The default import, `L`, is also a shorthand function for lens composition and
+lifting.  The semantics can be described as
+
+```
+L(l1, ..., lN) === R.compose(lift(l1), ..., lift(lN))
+```
+
+where
+
+```js
+const lift = l => {
+  switch (typeof l) {
+  case "string": return L.prop(l)
+  case "number": return L.index(l)
+  default:       return l
+  }
+}
+```
+
+## Lenses
+
+### L.prop(string)
+
+`L.prop(string)` is much like `R.lensProp(string)` (see
+[lensProp](http://ramdajs.com/0.19.0/docs/#lensProp)), but composes 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.
+
+Examples:
+
+```js
+> L.set(L("x", "y"), undefined, {x: {y: 1}})
+undefined
+> L.set(L("x", "y"), 2, {x: {y: 1}})
+{ x: { y: 2 } }
+> L.set(L("x", "y"), undefined, {x: {y: 1}, z: 3})
+{ z: 3 }
+> L.set(L("x", "y"), 2, {x: {y: 1}, z: 3})
+{ x: { y: 2 }, z: 3 }
+> L.view(L("x", "y"), undefined)
+undefined
+```
+
+### L.index(integer)
+
+`L.index(integer)` is like `R.lensIndex(integer)` (see
+[lensIndex](http://ramdajs.com/0.19.0/docs/#lensIndex)), but composes as a
+partial lens:
+* When viewing an undefined array index or an undefined array, the result is
+  undefined.
+* When setting an array index to undefined, the element is removed from the
+  resulting array, shifting all higher indices down by one.  If the result would
+  be an array without indices (ignoring length), the whole result will be
+  undefined.
+
+### L.find(predicate)
+
+`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` when the index set to the length of the array.
+
+### L.replace(inn, out)
+
+`L.replace(inn, out)`, when viewed, replaces the value `inn` with `out` and vice
+versa when set.  Values are compared using `R.equals` (see
+[equals](http://ramdajs.com/0.19.0/docs/#equals)).
+
+Examples:
+
+```js
+> L.view(L(L.replace(undefined, {type: "title", text: ""}), "text"), undefined)
+""
+> L.set(L(L.replace(undefined, {type: "title", text: ""}), "text"), "", {type: "title", text: "not empty"})
+undefined
+```

src/partial.lenses.js

@@ -8,6 +8,10 @@ import R from "ramda"
     return o
-  const r = {}
-  for (const p in o)
-    if (p !== k)
+  let r
+  for (const p in o) {
+    if (p !== k) {
+      if (undefined === r)
+        r = {}
       r[p] = o[p]
+    }
+  }
   return r
@@ -30,2 +34,7 @@ }
 
+const dropped = xs => Object.keys(xs).length === 0 ? undefined : xs
+
+
+//
+
 const conserve = f => (n0, o) => {
@@ -68,3 +77,3 @@ const n = f(n0, o)
       return xs
-    return xs.slice(0, i).concat(xs.slice(i+1))
+    return dropped(xs.slice(0, i).concat(xs.slice(i+1)))
   } else {
@@ -87,3 +96,3 @@ if (xs === undefined)
     if (i < xs.length)
-      return xs.slice(0, i).concat(xs.slice(i+1))
+      return dropped(xs.slice(0, i).concat(xs.slice(i+1)))
     return xs
@@ -90,0 +99,0 @@ } else {

test/tests.js

@@ -22,2 +22,4 @@ import R from "ramda"
 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])', () =>
@@ -40,2 +42,4 @@ L.set(L.find(R.equals(2)), undefined, [1, 2, 3]), [1, 3])
 describe('L.index', () => {
+  testEq('L.set(L(1), undefined, [,,])', () =>
+          L.set(L(1), undefined, [,,]), undefined)
   testEq('L.set(L(1), 4, [1, 2, 3])', () =>
@@ -62,2 +66,4 @@ L.set(L(1), 4, [1, 2, 3]), [1, 4, 3])
 describe('L.prop', () => {
+  testEq('L.set(L("x"), undefined, {x: 1})', () =>
+          L.set(L("x"), undefined, {x: 1}), undefined)
   testEq('L.set(L("y"), undefined, {x: 1, y: 2})', () =>
@@ -64,0 +70,0 @@ L.set(L("y"), undefined, {x: 1, y: 2}), {x: 1})

Fixed alerts

Major refactor

Supply chain risk

Package has recently undergone a major refactor. It may be unstable or indicate significant internal changes. Use caution when updating to versions that include significant changes.

Found 1 instance in 1 package

Improved metrics

Total package byte prevSize

27267

increased by48.39%

Lines of code

282

increased by7.63%

Number of lines in readme file

128

increased by2460%

Number of medium supply chain risk alerts

0

decreased by-100%

No dependency changes