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array.prototype.reduce

An ES5 spec-compliant `Array.prototype.reduce` shim/polyfill/replacement that works as far down as ES3.

    1.0.6latest
    GitHub
    npm

Version published
Maintainers
1
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6,913,344
increased by3.43%

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Changelog

Source

v1.0.6 - 2023-08-29

Commits

  • [Deps] update define-properties, es-abstract 5afbf91
  • [Dev Deps] update @es-shims/api, @ljharb/eslint-config, aud, tape abc82a9

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Source

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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

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Last updated on 30 Aug 2023

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