list-fns - npm Package Compare versions

Comparing version 1.2.0 to 1.3.0

CHANGELOG.md

 # Changelog
 
+## 1.3.0
+
+- Adds `groupByMany`
+
 ## 1.2.0
@@ -4,0 +8,0 @@

dist/index.d.ts

@@ -375,2 +375,14 @@ /** Use with: `filter`
  *
+ * Given a function `func` that returns a list of keys, returns an object of lists of elements. Works like `groupBy` except that `func` should return a list of keys. Good for grouping objects by properties that are arrays. An empty object must be passed as the second argument to `reduce`
+```ts
+const b1: B = { items: ["a", "b"] };
+const b2: B = { items: ["a"] };
+
+[b1, b2].reduce(groupByMany(b => b.items), {});
+// Returns { a: [{ items: ["a", "b"] }, { items: ["a"] }], b: [{ items: ["b"] }] }
+```
+ */
+export declare const groupByMany: <K extends string, V>(func: (el: V) => K[] | undefined) => (acc: Record<K, V[]>, el: V) => Record<K, V[]>;
+/** Use with: `reduce`
+ *
  * Given a property name, returns an object of lists of elements, grouped by the values for that property. A second argument must be passed to `reduce`. For javascript an empty object is enough. For typescript an object with properties or a type cast is required.
@@ -377,0 +389,0 @@ ```ts

dist/index.js

 "use strict";
 Object.defineProperty(exports, "__esModule", { value: true });
-exports.countBy = exports.partition = exports.groupByProperty = exports.groupBy = exports.minByProperty = exports.minBy = exports.min = exports.maxByProperty = exports.maxBy = exports.max = exports.sumByProperty = exports.sumBy = exports.sum = exports.get = exports.byProperty = exports.byValue = exports.by = exports.propertyIsntOneOf = exports.isntOneOfBy = exports.isntOneOf = exports.excludeByProperty = exports.excludeBy = exports.exclude = exports.propertyIsOneOf = exports.isOneOfBy = exports.isOneOf = exports.intersectionByProperty = exports.intersectionBy = exports.intersection = exports.has = exports.propertyIsnt = exports.isntBy = exports.isnt = exports.propertyIs = exports.isBy = exports.is = exports.uniqueByProperty = exports.unique = exports.uniqueBy = exports.duplicatesByProperty = exports.duplicates = exports.duplicatesBy = exports.or = exports.isDefined = void 0;
+exports.countBy = exports.partition = exports.groupByProperty = exports.groupByMany = exports.groupBy = exports.minByProperty = exports.minBy = exports.min = exports.maxByProperty = exports.maxBy = exports.max = exports.sumByProperty = exports.sumBy = exports.sum = exports.get = exports.byProperty = exports.byValue = exports.by = exports.propertyIsntOneOf = exports.isntOneOfBy = exports.isntOneOf = exports.excludeByProperty = exports.excludeBy = exports.exclude = exports.propertyIsOneOf = exports.isOneOfBy = exports.isOneOf = exports.intersectionByProperty = exports.intersectionBy = exports.intersection = exports.has = exports.propertyIsnt = exports.isntBy = exports.isnt = exports.propertyIs = exports.isBy = exports.is = exports.uniqueByProperty = exports.unique = exports.uniqueBy = exports.duplicatesByProperty = exports.duplicates = exports.duplicatesBy = exports.or = exports.isDefined = void 0;
 exports.isDefined = function (x) {
@@ -116,2 +116,9 @@ return typeof x !== "undefined";
 }; };
+exports.groupByMany = function (func) { return function (acc, el) {
+    var groupNames = func(el) || [];
+    groupNames.forEach(function (key) {
+        acc[key] = (acc[key] || []).concat(el);
+    });
+    return acc;
+}; };
 exports.groupByProperty = function (key) { return function (acc, el) {
@@ -118,0 +125,0 @@ var _a;

package.json

 {
   "name": "list-fns",
-  "version": "1.2.0",
+  "version": "1.3.0",
   "description": "A collection of utility functions to be used with .map, .filter, .sort and .reduce",
@@ -5,0 +5,0 @@ "main": "dist/index.js",

README.md

@@ -66,2 +66,3 @@ # list-fns
 <li><a href="#groupBy">groupBy</a></li>
+<li><a href="#groupByMany">groupByMany</a></li>
 <li><a href="#groupByProperty">groupByProperty</a></li>
@@ -509,2 +510,43 @@ <li><a href="#has">has</a></li>
 
+### <div id="groupByMany"></div> groupByMany
+
+
+```ts
+groupByMany: <K extends string, V>(func: (el: V) => K[] | undefined) => (acc: Record<K, V[]>, el: V) => Record<K, V[]>
+```
+
+
+Use with: `reduce` 
+
+Given a function `func` that returns a list of keys, returns an object of lists of elements. Works like `groupBy` except that `func` should return a list of keys. Good for grouping objects by properties that are arrays. An empty object must be passed as the second argument to `reduce` 
+
+```ts
+const b1: B = { items: ["a", "b"] };
+const b2: B = { items: ["a"] };
+
+[b1, b2].reduce(groupByMany(b => b.items), {});
+// Returns { a: [{ items: ["a", "b"] }, { items: ["a"] }], b: [{ items: ["b"] }] }
+
+```
+
+
+<details>
+  <summary>Implementation</summary>
+  <p>
+    
+```ts
+const groupByMany = <K extends string, V>(
+  func: (el: V) => K[] | undefined
+) => (acc: Record<K, V[]>, el: V): Record<K, V[]> => {
+  const groupNames = func(el) || [];
+  groupNames.forEach(key => {
+    acc[key] = (acc[key] || []).concat(el);
+  });
+  return acc;
+}
+```
+
+  <p>
+</details>
+
 ### <div id="groupByProperty"></div> groupByProperty
@@ -511,0 +553,0 @@

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Improved metrics

Total package byte prevSize

56572

increased by3.76%

Lines of code

554

increased by3.36%

Number of lines in readme file

1596

increased by2.7%

No dependency changes