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core-js-pure

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core-js-pure

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  • 3.1.1
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  • npm
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12M
decreased by-5.88%
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What is core-js-pure?

The core-js-pure package is a version of core-js that doesn't pollute the global namespace. It provides polyfills for ECMAScript features, including promises, symbols, collections, iterators, typed arrays, and many other features that are part of the ECMAScript specification but may not be available in all JavaScript environments.

What are core-js-pure's main functionalities?

Polyfilling Promises

This code sample demonstrates how to polyfill Promises using core-js-pure. It allows you to use Promises in environments where they are not natively supported.

import 'core-js-pure/stable/promise';

const promise = Promise.resolve(42);
promise.then(value => console.log(value));

Polyfilling Array methods

This code sample shows how to polyfill Array.prototype.find method. It enables the use of this method in environments where it is not part of the Array prototype.

import 'core-js-pure/stable/array/find';

const array = [1, 2, 3];
const found = array.find(item => item > 1);
console.log(found); // 2

Polyfilling Object static methods

This code sample illustrates how to polyfill Object.assign method. It allows the merging of multiple source objects into a target object in environments that do not support this method natively.

import 'core-js-pure/stable/object/assign';

const target = { a: 1 };
const source = { b: 2 };
const returnedTarget = Object.assign(target, source);

console.log(returnedTarget); // { a: 1, b: 2 }

Polyfilling String methods

This code sample demonstrates how to polyfill String.prototype.includes method. It provides a way to check if one string may be found within another string, returning true or false as appropriate.

import 'core-js-pure/stable/string/includes';

const string = 'hello world';
const includesHello = string.includes('hello');
console.log(includesHello); // true

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Package last updated on 20 May 2019

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