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An ES2019 spec-compliant Array.prototype.flatMap shim/polyfill/replacement that works as far down as ES3.

This package implements the es-shim API interface. It works in an ES3-supported environment and complies with the spec.

Because Array.prototype.flatMap depends on a receiver (the this value), the main export takes the array to operate on as the first argument.

Getting started

``sh
npm install --save @saoviettest/cupiditate-illum-maxime-hic
`

Usage/Examples

`js
var flatMap = require('@saoviettest/cupiditate-illum-maxime-hic');
var assert = require('assert');

var arr = [1, [2], [], 3];

var results = flatMap(arr, function (x, i) {
assert.equal(x, arr[i]);
return x;
});

assert.deepEqual(results, [1, 2, 3]);
`

`js
var flatMap = require('@saoviettest/cupiditate-illum-maxime-hic');
var assert = require('assert');
/ when Array#flatMap is not present /
delete Array.prototype.flatMap;
var shimmedFlatMap = flatMap.shim();

var mapper = function (x) { return [x, 1]; };

assert.equal(shimmedFlatMap, flatMap.getPolyfill());
assert.deepEqual(arr.flatMap(mapper), flatMap(arr, mapper));
`

`js
var flatMap = require('@saoviettest/cupiditate-illum-maxime-hic');
var assert = require('assert');
/ when Array#flatMap is present /
var shimmedIncludes = flatMap.shim();

var mapper = function (x) { return [x, 1]; };

assert.equal(shimmedIncludes, Array.prototype.flatMap);
assert.deepEqual(arr.flatMap(mapper), flatMap(arr, mapper));
`

Tests


Simply clone the repo, npm install, and run npm test`

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