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Fast Loops\n\nA collection of small, performant & immutable iteration utilities for Arrays and Objects.\n\n![\"TravisCI\"](\"https://travis-ci.org/rofrischmann/fast-loops.svg?branch=master\")
![\"Test](\"https://codeclimate.com/github/rofrischmann/fast-loops/badges/coverage.svg\")
![\"gzipped](\"https://img.shields.io/badge/gzipped+minified-0.47kb-brightgreen.svg\")
![\"npm](\"https://img.shields.io/npm/dm/fast-loops.svg\")
![\"npm](\"https://badge.fury.io/js/fast-loops.svg\")
\n\n## Installation\n```sh\nyarn add fast-loops\n```\nAlternatively use `npm i --save fast-loops`.\n\n## Why?\nBecause JavaScript's native \"functional\" APIs such as `forEach`, `reduce`, `map` and `filter` are slow. There're many different utility packages out there already, e.g. lodash. But lodash's `reduce` method itself is 4.5kb gzipped which is way too much for a simple Array/Object reduce utility.\n\n## API\n\n> All methods are immutable by defaults, yet they're not safe from mutating.\n\n* [arrayEach](#arrayeacharr-iterator)\n* [arrayFilter](#arrayfilterarr-filter)\n* [arrayMap](#arraymaparr-mapper)\n* [arrayReduce](#arrayreducearr-reducer-accumulator)\n* [objectEach](#objecteachobj-iterator)\n* [objectFilter](#objectfilterobj-filter)\n* [objectFind](#objectfindobj-query)\n* [objectMap](#objectmapobj-mapper)\n* [objectReduce](#objectreduceobj-reducer-accumulator)\n* [objectRenameKeys](#objectrenamekeysobj-keys)\n* [objectMergeDeep](#objectmergedeepbase-objs)\n\n### `arrayEach(arr, iterator)`\n\nIterates over each value in the array.
\nSimilar to `Array.prototype.forEach`.\n\n1. `arr` (*Array*): The array to iterate over\n2. `iterator` (*Function*): The iterator method with the signature `(value, index, length, arr) => void`\n\n```javascript\nimport { arrayEach } from 'fast-loops'\n\narrayEach([1, 2, 3], console.log)\n// 1, 0, 3, [1, 2, 3]\n// 2, 1, 3, [1, 2, 3]\n// 3, 2, 3, [1, 2, 3]\n```\n\n\n### `arrayFilter(arr, filter)`\n\nFilters an array according to the filter criteria.
\nSimilar to `Array.prototype.filter`.\n\n1. `arr` (*Array*): The array that gets filtered\n2. `filter` (*Function*): The filter method with the signature `(value, index, length, arr) => boolean`\n\n```javascript\nimport { arrayFilter } from 'fast-loops'\n\nconst biggerThan2 = arrayFilter([1, 2, 3, 4], value => value > 2)\n\nconsole.log(biggerThan2)\n// => [3, 4]\n```\n\n### `arrayMap(arr, mapper)`\n\nMaps an array by running the mapper on each value.
\nSimilar to `Array.prototype.map`.\n\n1. `arr` (*Array*): The array that gets mapped\n2. `mapper` (*Function*): The mapping method with the signature `(value, index, length, arr) => newValue`\n\n```javascript\nimport { arrayMap } from 'fast-loops'\n\nconst square = arrayMap([1, 2, 3, 4], value => value * value)\n\nconsole.log(square)\n// => [1, 4, 9, 16]\n```\n\n### `arrayReduce(arr, reducer, accumulator)`\n\nReduces an array based on the accumulator.
\nSimilar to `Array.prototype.reduce`.\n\n1. `arr` (*Array*): The array that gets reduced\n2. `reducer` (*Function*): The reducer method with the signature `(accumulator, value, index, length, arr) => accumulator`\n3. `accumulator` (*any*): The initial accumulator value\n\n```javascript\nimport { arrayReduce } from 'fast-loops'\n\nconst sum = arrayReduce([1, 2, 3, 4], (out, value) => out + value, 0)\n\nconsole.log(sum)\n// => 10\n```\n\n### `objectEach(obj, iterator)`\n\nIterates over each key in the object.\n\n1. `obj` (*Object*): The object to iterate over\n2. `iterator` (*Function*): The iterator method with the signature `(value, key, obj) => void`\n\n```javascript\nimport { objectEach } from 'fast-loops'\n\nobjectEach({ 1: 10, 2: 20, 3: 30 }, console.log)\n// 10, 1, { 1: 10, 2: 20, 3: 30 }\n// 20, 2, { 1: 10, 2: 20, 3: 30 }\n// 30, 3, { 1: 10, 2: 20, 3: 30 }\n```\n\n### `objectFilter(obj, filter)`\n\nFilters an object's keys according to the filter criteria.\n\n1. `obj` (*Object*): The object that gets filtered\n2. `filter` (*Function*): The filter method with the signature `(value, key, obj) => boolean`\n\n```javascript\nimport { objectFilter } from 'fast-loops'\n\nconst filter = (value, key) => value > 20 && parseInt(key) % 2 !== 0\nconst biggerThan20AndOddKey = objectFilter({ 1: 10, 2: 20, 3: 30, 4: 40 }, filter)\n\nconsole.log(biggerThan20AndOddKey)\n// => { 3: 30 }\n```\n\n### `objectFind(obj, query)`\n\nTries to find a key-value pair that matches the query.
\nReturns the matching key or `undefined` if none matches.
\nIt's like `Array.prototype.find` but for objects.\n\n1. `obj` (*Object*): The object that gets queried\n2. `query` (*Function*): The query method with the signature `(value, key, obj) => boolean`\n\n```javascript\nimport { objectFind } from 'fast-loops'\n\nconst query = (value, key) => value > 20 && parseInt(key) % 2 === 0\nconst biggerThan20AndEvenKey = objectFind({ 1: 10, 2: 20, 3: 30, 4: 40 }, query)\n\nconsole.log(biggerThan20AndEvenKey)\n// => \"4\"\n```\n\n\n### `objectMap(obj, mapper)`\n\nMaps an object by running the `mapper` on each value.
\nSimilar to `Object.keys(obj).map(mapper)`.\n\n\n1. `obj` (*Object*): The object that gets reduced\n2. `mapper` (*Function*): The mapper method with the signature `(value, key, obj) => newValue`\n\n```javascript\nimport { objectMap } from 'fast-loops'\n\nconst mapped = objectMap({ 1: 10, 2: 20, 3: 30 }, (value, key) => value + parseInt(key))\n\nconsole.log(mapped)\n// => { 1: 11, 2: 22, 3: 33 }\n```\n\n### `objectReduce(obj, reducer, accumulator)`\n\nReduces an object based on the accumulator.\n\n1. `obj` (*Object*): The object that gets reduced\n2. `reducer` (*Function*): The reducer method with the signature `(accumulator, value, key, obj) => accumulator`\n3. `accumulator` (*any*): The initial accumulator value\n\n```javascript\nimport { objectReduce } from 'fast-loops'\n\nconst sumOfValues = objectReduce({ 1: 10, 2: 20, 3: 30 }, (out, value) => out + value, 0)\n\nconsole.log(sumOfValues)\n// => 60\n```\n\n### `objectRenameKeys(obj, keys)`\n\nRenames object keys.\n\n> Uses [objectReduce](#objectreduceobj-reducer-accumulator) under the hood.\n\n1. `obj` (*Object*): The object that gets reduced\n2. `keys` (*Object*): The keys mapping an old key to a new key\n\n```javascript\nimport { objectRenameKeys } from 'fast-loops'\n\nconst renamedObj = objectRenameKeys({ foo: 1, bar: 2 }, { foo: \"baz\" })\n\nconsole.log(sumOfValues)\n// => { baz: 1, bar: 2 }\n```\n\n\n### `objectMergeDeep(base, ...objs)`\n\nRecursively merges objects into a base object.\n\n1. `base` (*Object*): The base object which is changed\n2. `objs` (*Array\\*): A list of objects to be merged into the base object\n\n```javascript\nimport { objectMergeDeep } from 'fast-loops'\n\nconst base = {\n foo: 1,\n bar: {\n foo: 2\n }\n}\nconst mergedObj = objectMergeDeep(base, { baz: 3 }, { bar: { foo: 3 }})\n\nconsole.log(mergedObj)\n// => { foo: 1, bar: { foo: 3 }, baz: 3 }\n```\n\n## Direct Imports\nWhile we support the `module` key to support Tree Shaking, you might still want to import single methods without any overhead.\nYou can import every method using the full path to the method resource.\n\n```javascript\nimport objectReduce from 'fast-loops/lib/objectReduce'\n```\n\n## License\nfast-loops is licensed under the [MIT License](http://opensource.org/licenses/MIT).
\nDocumentation is licensed under [Creative Common License](http://creativecommons.org/licenses/by/4.0/).
\nCreated with ♥ by [@rofrischmann](http://rofrischmann.de).\n","_attachments":{},"homepage":"https://github.com/robinweser/fast-loops#readme","bugs":{"url":"https://github.com/robinweser/fast-loops/issues"},"license":"MIT"}