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array.prototype.flatmap

1.2.1 • Public • Published

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An ESnext 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 proposed 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

npm install --save array.prototype.flatmap

Usage/Examples

var flatMap = require('array.prototype.flatmap');
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]);
var flatMap = require('array.prototype.flatmap');
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));
var flatMap = require('array.prototype.flatmap');
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

install

npm i array.prototype.flatmap

Downloadsweekly downloads

459,526

version

1.2.1

license

MIT

homepage

github.com

repository

Gitgithub

last publish

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