eq (Lodash Compatibility)

Checks if two values are equivalent using SameValueZero comparison.

const isEqual = eq(value, other);

Reference

eq(value, other)

Use eq when you want to check if two values are equivalent. Unlike regular === comparison, it returns true when comparing NaN with NaN.

import { eq } from 'es-toolkit/compat';

// Basic usage
console.log(eq(1, 1)); // true
console.log(eq(0, -0)); // true (SameValueZero considers 0 and -0 equal)
console.log(eq(NaN, NaN)); // true
console.log(eq('a', 'a')); // true
console.log(eq('a', 'b')); // false

Behaves differently from Object.is().

// Using eq
console.log(eq(NaN, NaN)); // true
console.log(eq(0, -0)); // true

// Using Object.is (faster)
console.log(Object.is(NaN, NaN)); // true
console.log(Object.is(0, -0)); // false (Object.is considers 0 and -0 different)

// Using ===
console.log(NaN === NaN); // false
console.log(0 === -0); // true

Parameters

• value (any): The first value to compare.
• other (any): The second value to compare.

Returns

(boolean): Returns true if the values are equivalent, false otherwise.