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array.prototype.flatmap
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array.prototype.flatmap
An ES2019 spec-compliant `Array.prototype.flatMap` shim/polyfill/replacement that works as far down as ES3.
- 1.3.0latest
- Version published
- Maintainers
- 1
- Weekly downloads
- 11,384,316
- decreased by-3.99%
Weekly downloads
Readme
array.prototype.flatmap 
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
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
FAQs
What is array.prototype.flatmap?
An ES2019 spec-compliant `Array.prototype.flatMap` shim/polyfill/replacement that works as far down as ES3.
Is array.prototype.flatmap popular?
The npm package array.prototype.flatmap receives a total of 9,082,576 weekly downloads. As such, array.prototype.flatmap popularity was classified as popular.
Is array.prototype.flatmap well maintained?
We found that array.prototype.flatmap demonstrated a healthy version release cadence and project activity. It has 1 open source maintainer collaborating on the project.