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fast-equals

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fast-equals

A blazing fast equality comparison, either shallow or deep

  • 5.0.1
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3.7M
decreased by-4.15%
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1
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What is fast-equals?

The fast-equals package is a high-performance deep equality checking library that provides functions to determine if two values are deeply equal. It is optimized for speed and can handle complex data structures, including objects, arrays, dates, and more.

What are fast-equals's main functionalities?

deepEqual

Checks if two values are deeply equal, meaning all their nested properties are equal.

const { deepEqual } = require('fast-equals');
console.log(deepEqual({ foo: 'bar' }, { foo: 'bar' })); // true

shallowEqual

Checks if two values are shallowly equal, meaning their immediate properties are equal without checking nested objects.

const { shallowEqual } = require('fast-equals');
console.log(shallowEqual({ foo: 'bar' }, { foo: 'bar' })); // true

circularDeepEqual

Checks if two values are deeply equal, including when they have circular references.

const { circularDeepEqual } = require('fast-equals');
const objectA = { foo: 'bar' };
objectA.self = objectA;
const objectB = { foo: 'bar' };
objectB.self = objectB;
console.log(circularDeepEqual(objectA, objectB)); // true

circularShallowEqual

Checks if two values are shallowly equal, including when they have circular references.

const { circularShallowEqual } = require('fast-equals');
const arrayA = ['foo', 'bar'];
arrayA.push(arrayA);
const arrayB = ['foo', 'bar'];
arrayB.push(arrayB);
console.log(circularShallowEqual(arrayA, arrayB)); // true

sameValueZeroEqual

Checks if two values are equal according to the SameValueZero comparison algorithm, which treats NaN as equal to NaN and -0 as equal to +0.

const { sameValueZeroEqual } = require('fast-equals');
console.log(sameValueZeroEqual(NaN, NaN)); // true

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Package last updated on 18 Mar 2023

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