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https://www.w3schools.com/jsref/jsref_map.asp
The map() method creates a new array with the results of calling a function for every array element. The map() method calls the provided function once for each element in an array, in order. Note: map() does not execute the function for array elements without values. Note: this method does not change the original array.
https://medium.com/poka-techblog/simplify-your-javascript-use-map-reduce-and-filter-bd02c593cc2d
Jan 29, 2018 · If you’re starting in JavaScript, maybe you haven’t heard of .map(), .reduce(), and .filter().For me, it took a while as I had to support Internet Explorer 8 until a couple years ago.Author: Etienne Talbot
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/flat
Aug 22, 2019 · The depth level specifying how deep a nested array structure should be flattened. Defaults to 1. Return value. A new array with the sub-array elements concatenated into it. Examples Flattening nested arrays62%
https://www.w3schools.com/JS/js_array_iteration.asp
JavaScript Array Iteration Methods Previous Next ... Array.map() The map() ... The first browser versions with full support is listed below. 45: 12: 25: 8: 32: Array.findIndex() The findIndex() method returns the index of the first array element that passes a test function.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/from
Array.from() has an optional parameter mapFn, which allows you to execute a map function on each element of the array (or subclass object) that is being created. More clearly, Array.from(obj, mapFn, thisArg) has the same result as Array.from(obj).map(mapFn, thisArg), except that it does not create an32%
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map
The Map object holds key-value pairs and remembers the original insertion order of the keys. Any value (both objects and primitive values) may be used as either a key or a value.. Description. A Map object iterates its elements in insertion order — a for...of loop returns an array of [key, value] for each iteration.. Key equality. Key equality is based on the sameValueZero algorithm.
http://kangax.github.io/compat-table/es5/
ECMAScript 5 6 2016+ next intl non-standard compatibility table. ... §Array.prototype.map ... ` both yield false - whereas in a compliant browser, the former would give `false`, the latter `true`. As such, ES5 array iteration methods can only be shimmed reliably when dealing with dense arrays.
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