array.prototype.reduce (1.0.8)
Published 2026-02-24 13:53:01 +00:00 by atheaadmin
Installation
registry=npm install array.prototype.reduce@1.0.8"array.prototype.reduce": "1.0.8"About this package
array.prototype.reduce 
An ES5 spec-compliant Array.prototype.reduce 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.reduce depends on a receiver (the “this” value), the main export takes the array to operate on as the first argument.
Example
var reduce = require('array.prototype.reduce');
var assert = require('assert');
assert.equal(reduce([1, 2, 3], function (prev, x) { return prev + x; }), 6);
assert.equal(reduce([1, 2, 3], function (prev, x) { return prev + x; }, 1), 7);
var reduce = require('array.prototype.reduce');
var assert = require('assert');
/* when Array#reduce is not present */
delete Array.prototype.reduce;
var shimmed = reduce.shim();
assert.equal(shimmed, reduce.getPolyfill());
var arr = [1, 2, 3];
var sum = function (a, b) { return a + b; };
assert.equal(arr.reduce(sum), reduce(arr, sum));
assert.equal(arr.reduce(sum), 6);
assert.equal(arr.reduce(sum, 1), 7);
var reduce = require('array.prototype.reduce');
var assert = require('assert');
/* when Array#reduce is present */
var shimmed = reduce.shim();
assert.equal(shimmed, Array.prototype.reduce);
assert.equal(arr.reduce(sum), reduce(arr, sum));
Tests
Simply clone the repo, npm install, and run npm test
Dependencies
Dependencies
| ID | Version |
|---|---|
| call-bind | ^1.0.8 |
| call-bound | ^1.0.4 |
| define-properties | ^1.2.1 |
| es-abstract | ^1.23.9 |
| es-array-method-boxes-properly | ^1.0.0 |
| es-errors | ^1.3.0 |
| es-object-atoms | ^1.1.1 |
| is-string | ^1.1.1 |
Development Dependencies
| ID | Version |
|---|---|
| @es-shims/api | ^2.5.1 |
| @ljharb/eslint-config | ^21.1.1 |
| auto-changelog | ^2.5.0 |
| encoding | ^0.1.13 |
| eslint | =8.8.0 |
| evalmd | ^0.0.19 |
| functions-have-names | ^1.2.3 |
| has-strict-mode | ^1.1.0 |
| in-publish | ^2.0.1 |
| npmignore | ^0.3.1 |
| nyc | ^10.3.2 |
| safe-publish-latest | ^2.0.0 |
| tape | ^5.9.0 |
Keywords
Array.prototype.reduce
reduce
array
ES5
shim
polyfill
es-shim API