object-is (original) (raw)

1.1.6 • Public • Published a year ago

• Readme
• Code Beta
• 2 Dependencies
• 499 Dependents
• 11 Versions

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.

Example

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));

Tests

Simply clone the repo, npm install, and run npm test