partial.lenses - npm Package Compare versions

Comparing version 0.4.0 to 0.5.0

lib/partial.lenses.js

@@ -8,2 +8,3 @@ "use strict";
 });
+exports.lift = undefined;
 
@@ -68,3 +69,3 @@ var _ramda = require("ramda");
 
-var lift = function lift(l) {
+var lift = exports.lift = function lift(l) {
   switch (typeof l === "undefined" ? "undefined" : _typeof(l)) {
@@ -88,11 +89,47 @@ case "string":
 
-L.compose = _ramda2.default.compose;
+L.compose = L;
 L.delete = _ramda2.default.curry(function (l, s) {
-  return _ramda2.default.set(l, undefined, s);
+  return _ramda2.default.set(lift(l), undefined, s);
 });
 L.lens = _ramda2.default.lens;
-L.over = _ramda2.default.over;
-L.set = _ramda2.default.set;
-L.view = _ramda2.default.view;
+L.over = _ramda2.default.curry(function (l, x2x, s) {
+  return _ramda2.default.over(lift(l), x2x, s);
+});
+L.set = _ramda2.default.curry(function (l, x, s) {
+  return _ramda2.default.set(lift(l), x, s);
+});
+L.view = _ramda2.default.curry(function (l, s) {
+  return _ramda2.default.view(lift(l), s);
+});
 
+L.firstOf = function () {
+  for (var _len2 = arguments.length, ls = Array(_len2), _key2 = 0; _key2 < _len2; _key2++) {
+    ls[_key2] = arguments[_key2];
+  }
+
+  switch (ls.length) {
+    case 0:
+      throw new Error("firstOf called without arguments");
+    case 1:
+      return lift(ls[0]);
+    default:
+      var choose = function choose(target, otherwise) {
+        for (var i = 0, n = ls.length; i < n; ++i) {
+          var l = ls[i];
+          var r = _ramda2.default.view(lift(l), target);
+          if (undefined !== r) return otherwise ? l : r;
+        }
+        return otherwise;
+      };
+
+      return function (toFunctor) {
+        return function (target) {
+          return _ramda2.default.map(function (focus) {
+            return _ramda2.default.set(lift(choose(target, ls[0])), focus, target);
+          }, toFunctor(choose(target)));
+        };
+      };
+  }
+};
+
 L.replace = _ramda2.default.curry(function (inn, out) {
@@ -110,2 +147,5 @@ return _ramda2.default.lens(function (x) {
 };
+L.define = function (v) {
+  return _ramda2.default.compose(L.required(v), L.default(v));
+};
 
@@ -161,2 +201,2 @@ L.normalize = function (transform) {
 exports.default = L;
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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\nconst 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 = (...ls) => ls.length === 1 ? lift(ls[0]) : R.compose(...ls.map(lift))\n\nL.compose = R.compose\nL.delete = R.curry((l, s) => R.set(l, undefined, s))\nL.lens = R.lens\nL.over = R.over\nL.set = R.set\nL.view = R.view\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)\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 = 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 = (...ls) => ls.length === 1 ? lift(ls[0]) : R.compose(...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 = (...ls) => {\n  switch (ls.length) {\n  case 0:\n    throw new Error(\"firstOf called without arguments\")\n  case 1:\n    return lift(ls[0])\n  default:\n    const choose = (target, otherwise) => {\n      for (let i=0, n=ls.length; i<n; ++i) {\n        const l = ls[i]\n        const r = R.view(lift(l), target)\n        if (undefined !== r)\n          return otherwise ? l : r\n      }\n      return otherwise\n    }\n\n    return toFunctor => target =>\n      R.map(focus => R.set(lift(choose(target, ls[0])), focus, target),\n            toFunctor(choose(target)))\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"]}

package.json

 {
   "name": "partial.lenses",
-  "version": "0.4.0",
+  "version": "0.5.0",
   "description": "Ramda compatible lenses",
@@ -5,0 +5,0 @@ "main": "lib/partial.lenses.js",

README.md

@@ -1,2 +0,2 @@
-[![npm version](https://badge.fury.io/js/partial.lenses.svg)](http://badge.fury.io/js/partial.lenses)
+[ [Examples](#examples) | [Reference](#reference) | [Background](#background) ]
 
@@ -8,7 +8,10 @@ This library provides a collection of [Ramda](http://ramdajs.com/) compatible
 
-Index:
-* [Examples](#examples)
-* [Reference](#reference)
-* [Background](#background)
+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.
 
+[![npm version](https://badge.fury.io/js/partial.lenses.svg)](http://badge.fury.io/js/partial.lenses)
+
 ## Examples
@@ -75,3 +78,3 @@
 > L.set(textIn("fi"), "Otsikko", data)
-{ contents: [ { language: "en", text: "The title" },
+{ contents: [ { language: "en", text: "Title" },
               { language: "fi", text: "Otsikko" },
@@ -87,3 +90,3 @@ { language: "sv", text: "Rubrik" } ] }
 > L.set(textIn("sv"), undefined, data)
-{ contents: [ { language: "en", text: "The title" } ] }
+{ contents: [ { language: "en", text: "Title" } ] }
 ```
@@ -99,2 +102,5 @@
 
+Note that unless required and default values are explicitly specified as part of
+the lens, they will both be undefined.
+
 ## Reference
@@ -112,27 +118,18 @@
 
-For convenience, you can access basic operations on lenses via the default
-import `L`:
+You can access basic operations on lenses via the default import `L`:
 
-* `L.compose(l1, ..., ln)` is the same as `R.compose(l1, ..., lN)` (see [compose](http://ramdajs.com/0.19.0/docs/#compose)).
-* `L.lens(get, set)` is the same as `R.lens(get, set)` (see [lens](http://ramdajs.com/0.19.0/docs/#lens)).
-* `L.over(l, x2x, s)` is the same as `R.over(l, x2x, s)` (see [over](http://ramdajs.com/0.19.0/docs/#over)).
-* `L.set(l, x, s)` is the same as `R.set(l, x, s)` (see [set](http://ramdajs.com/0.19.0/docs/#set)).
-* `L.view(l, s)` is the same as `R.view(l, s)` (see [view](http://ramdajs.com/0.19.0/docs/#view)).
+* `L(l1, ..., ln)` and `L.compose(l1, ..., ln)` both are the same as
+  `R.compose(lift(l1), ..., lift(lN))` (see
+  [compose](http://ramdajs.com/0.19.0/docs/#compose)).
+* `L.lens(get, set)` is the same as `R.lens(get, set)` (see
+  [lens](http://ramdajs.com/0.19.0/docs/#lens)).
+* `L.over(l, x2x, s)` is the same as `R.over(lift(l), x2x, s)` (see
+  [over](http://ramdajs.com/0.19.0/docs/#over)).
+* `L.set(l, x, s)` is the same as `R.set(lift(l), x, s)` (see
+  [set](http://ramdajs.com/0.19.0/docs/#set)).
+* `L.view(l, s)` is the same as `R.view(lift(l), s)` (see
+  [view](http://ramdajs.com/0.19.0/docs/#view)).
 
-For convenience, there is also a shorthand for delete:
+The `lift` operation is defined as
 
-* `L.delete(l, s)` is the same as `R.set(l, undefined, s)`.
-
-### Shorthand composition and lifting
-
-The default import, `L`, is also a shorthand function for lens composition (see
-[compose](http://ramdajs.com/0.19.0/docs/#compose)) and lifting.  The semantics
-can be described as
-
-```
-L(l1, ..., lN) === R.compose(lift(l1), ..., lift(lN))
-```
-
-where
-
 ```js
@@ -148,4 +145,20 @@ const lift = l => {
 
-Note that `L.compose` does not perform lifting.
+and is available as a non-default export.
 
+#### L.delete(l, s)
+
+For convenience, there is also a shorthand for delete:
+
+* `L.delete(l, s)` is the same as `R.set(lift(l), undefined, s)`.
+
+#### L.firstOf(l1, ..., lN)
+
+`L.firstOf(l1, ..., lN)` returns a partial lens that acts like the first of the
+given lenses 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 the first of
+the given lenses.
+
+Note that `L.firstOf` is an associative operation, but there is no identity
+element.
+
 ### Lenses
@@ -155,4 +168,4 @@
 
-`L.prop(string)` is much like `R.lensProp(string)` (see
-[lensProp](http://ramdajs.com/0.19.0/docs/#lensProp)), but composes as a partial
+`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:
@@ -164,22 +177,7 @@ * When viewing an undefined property or an undefined object, the result is
 
-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:
+`L.index(integer)` or `L(integer)` is similar to `R.lensIndex(integer)` (see
+[lensIndex](http://ramdajs.com/0.19.0/docs/#lensIndex)), but acts as a partial
+lens:
 * When viewing an undefined array index or an undefined array, the result is
@@ -220,19 +218,5 @@ undefined.
 
-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
-```
-
 The use case for `replace` is to handle optional and required properties and
-elements.  In most cases, rather than using `replace`, you will use a
-combination of `required` and `default`:
+elements.  In most cases, rather than using `replace`, you will make selective
+use of `required` and `default`:
 
@@ -247,2 +231,6 @@ ##### L.default(out)
 
+##### L.define(value)
+
+`L.define(value)` is the same as `L(L.required(value), L.default(value))`.
+
 ## Background
@@ -302,7 +290,1 @@
 [lensProp](http://ramdajs.com/0.19.0/docs/#lensProp)).
-
-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.

src/partial.lenses.js

@@ -48,3 +48,3 @@ import R from "ramda"
 
-const lift = l => {
+export const lift = l => {
   switch (typeof l) {
@@ -59,9 +59,32 @@ case "string": return L.prop(l)
 
-L.compose = R.compose
-L.delete = R.curry((l, s) => R.set(l, undefined, s))
+L.compose = L
+L.delete = R.curry((l, s) => R.set(lift(l), undefined, s))
 L.lens = R.lens
-L.over = R.over
-L.set = R.set
-L.view = R.view
+L.over = R.curry((l, x2x, s) => R.over(lift(l), x2x, s))
+L.set = R.curry((l, x, s) => R.set(lift(l), x, s))
+L.view = R.curry((l, s) => R.view(lift(l), s))
 
+L.firstOf = (...ls) => {
+  switch (ls.length) {
+  case 0:
+    throw new Error("firstOf called without arguments")
+  case 1:
+    return lift(ls[0])
+  default:
+    const choose = (target, otherwise) => {
+      for (let i=0, n=ls.length; i<n; ++i) {
+        const l = ls[i]
+        const r = R.view(lift(l), target)
+        if (undefined !== r)
+          return otherwise ? l : r
+      }
+      return otherwise
+    }
+
+    return toFunctor => target =>
+      R.map(focus => R.set(lift(choose(target, ls[0])), focus, target),
+            toFunctor(choose(target)))
+  }
+}
+
 L.replace = R.curry((inn, out) =>
@@ -73,2 +96,3 @@ R.lens(x => R.equals(x, inn) ? out : x,
 L.required = inn => L.replace(inn, undefined)
+L.define = v => R.compose(L.required(v), L.default(v))
 
@@ -75,0 +99,0 @@ L.normalize = transform =>

test/tests.js

@@ -43,8 +43,8 @@ import R from "ramda"
           L.set(L(1), undefined, [,,]), undefined)
-  testEq('L.set(L(L.required([]), 1), undefined, [,,])', () =>
-          L.set(L(L.required([]), 1), 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(L(2), 4, undefined)', () =>
-          L.set(L(2), 4, undefined), [,, 4])
+  testEq('L.set(2, 4, undefined)', () =>
+          L.set(2, 4, undefined), [,, 4])
   testEq('L.set(L(2), 4, [1])', () =>
@@ -56,8 +56,8 @@ L.set(L(2), 4, [1]), [1,, 4])
           L.set(L(1), undefined, [1, 2, 3]), [1, 3])
-  testEq('L.set(L(2), undefined, [1, 2, 3])', () =>
-          L.set(L(2), undefined, [1, 2, 3]), [1, 2])
+  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(L(5), undefined)', () =>
-          L.view(L(5), undefined), undefined)
+  testEq('L.view(5, undefined)', () =>
+          L.view(5, undefined), undefined)
   testEq('L.view(L(5), [1, 2, 3])', () =>
@@ -72,14 +72,14 @@ L.view(L(5), [1, 2, 3]), undefined)
           L.set(L("x", L.required(null)), undefined, {x: 1}), {x: null})
-  testEq('L.set(L("x", L.required(null)), 2, {x: 1})', () =>
-          L.set(L("x", L.required(null)), 2, {x: 1}), {x: 2})
-  testEq('L.delete(L("y"), {x: 1, y: 2})', () =>
-          L.delete(L("y"), {x: 1, y: 2}), {x: 1})
+  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(L("z"), 3, {x: 1, y: 2})', () =>
-          L.set(L("z"), 3, {x: 1, y: 2}), {x: 1, y: 2, z: 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(L("z"), undefined)', () =>
-          L.view(L("z"), undefined), undefined)
+  testEq('L.view("z", undefined)', () =>
+          L.view("z", undefined), undefined)
   testEq('L.view(L("z"), {x: 1})', () =>
@@ -114,15 +114,11 @@ L.view(L("z"), {x: 1}), undefined)
           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]),
          [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),
          [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]),
          undefined)
-
   testEq('L.set(L(L.normalize(R.sortBy(R.identity)), L.find(R.equals(2))), undefined, [1,3,2,5])', () =>
@@ -132,1 +128,24 @@ L.set(L(L.normalize(R.sortBy(R.identity)), L.find(R.equals(2))), undefined, [1,3,2,5]),
 })
+
+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})
+})

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