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equals javascript Code Snippet in 2023

objectarraytyperecursionadvanced

Last Updated: 28 January 2023

Performs a deep comparison between two values to determine if they are equivalent.

  • Check if the two values are identical.
  • Check if both values are Date objects with the same time, using Date.prototype.getTime().
  • Check if both values are non-object values with an equivalent value (strict comparison).
  • Check if only one value is null or undefined or if their prototypes differ.
  • If none of the above conditions are met, use Object.keys() to check if both values have the same number of keys.
  • Use Array.prototype.every() to check if every key in a exists in b and if they are equivalent by calling equals() recursively.
const equals = (a, b) => { if (a === b) return true; if (a instanceof Date && b instanceof Date) return a.getTime() === b.getTime(); if (!a || !b || (typeof a !== 'object' && typeof b !== 'object')) return a === b; if (a.prototype !== b.prototype) return false; const keys = Object.keys(a); if (keys.length !== Object.keys(b).length) return false; return keys.every(k => equals(a[k], b[k])); };
equals( { a: [2, { e: 3 }], b: [4], c: 'foo' }, { a: [2, { e: 3 }], b: [4], c: 'foo' } ); // true equals([1, 2, 3], { 0: 1, 1: 2, 2: 3 }); // true

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