The 'object-is' npm package provides a utility function for comparing two values, determining if they are the same value. This is particularly useful for edge cases in JavaScript comparisons, such as NaN, +0, and -0, where traditional equality checks (== or ===) might fail or not behave as expected.
Exact equality comparison
This feature allows for the comparison of two values to determine if they are exactly the same, including more accurate handling of special JavaScript cases like NaN and +/-0.
const objectIs = require('object-is');
console.log(objectIs('foo', 'foo')); // true
console.log(objectIs(window, window)); // true
console.log(objectIs('foo', 'bar')); // false
console.log(objectIs(0, -0)); // false
console.log(objectIs(NaN, NaN)); // trueA package that offers deep equality comparison. Unlike 'object-is', which only checks if two values are the same, 'is-equal' can compare objects and arrays deeply, making it suitable for more complex data structures.
This package also provides deep equality checks, similar to 'is-equal'. It compares the contents of objects and arrays recursively, which is more comprehensive than the simple value comparison provided by 'object-is'.
ES2015-compliant shim for Object.is - differentiates between -0 and +0, and can compare to NaN.
Essentially, Object.is returns the same value as === - but true for NaN, and false for -0 and +0.
This package implements the es-shim API interface. It works in an ES3-supported environment and complies with the spec.
Object.is = require('object-is');
var assert = require('assert');
assert.ok(Object.is());
assert.ok(Object.is(undefined));
assert.ok(Object.is(undefined, undefined));
assert.ok(Object.is(null, null));
assert.ok(Object.is(true, true));
assert.ok(Object.is(false, false));
assert.ok(Object.is('foo', 'foo'));
var arr = [1, 2];
assert.ok(Object.is(arr, arr));
assert.equal(Object.is(arr, [1, 2]), false);
assert.ok(Object.is(0, 0));
assert.ok(Object.is(-0, -0));
assert.equal(Object.is(0, -0), false);
assert.ok(Object.is(NaN, NaN));
assert.ok(Object.is(Infinity, Infinity));
assert.ok(Object.is(-Infinity, -Infinity));
Simply clone the repo, npm install, and run npm test
v1.1.6 - 2024-02-27
f8d0c06node/install instead of node/run 90fc01937339d8npmignore to autogenerate an npmignore file a257c1950af053eslint, @ljharb/eslint-config, @es-shims/api, safe-publish-latest, tape 86058c6eslint, @ljharb/eslint-config, aud, auto-changelog, functions-have-names, has-symbols, tape d5484eb68075c5f12fbb2eslint, @ljharb/eslint-config, aud, auto-changelog, has-symbols, tape 43eb235@es-shims/api, @ljharb/eslint-config, aud, npmignore, tape f306966e443b4a5165adceslint, @ljharb/eslint-config, tape e7ccf56call-bind, define-properties a3052dbac37ea67fe769fcall-bind b965cd3tape a737830define-properties, es-abstract 441eafbFAQs
ES2015-compliant shim for Object.is - differentiates between -0 and +0
The npm package object-is receives a total of 15,839,971 weekly downloads. As such, object-is popularity was classified as popular.
We found that object-is demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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