Does JavaScript Have a HashCode Equivalent for Object Equality?

Determining Object Equality in JavaScript

In JavaScript, determining object equality using the strict equality operator only reveals equality of object types. This raises the question of whether there exists a mechanism similar to Java's hash code value to ascertain object equality.

Is There a HashCode Equivalent in JavaScript?

A similar query on Stack Overflow ("Is there any kind of hashCode function in JavaScript?") highlights the need for a solution. The following scenario further demonstrates the necessity:

const obj1 = { name: "John Doe", age: 25 };
const obj2 = { name: "John Doe", age: 25 };

console.log(obj1 === obj2); // false (different memory references)

Equivalent Solution

Fortunately, JavaScript offers a solution in the form of the lodash library. It provides the isEqual() function, which:

const { isEqual } = require('lodash');

const result = isEqual(obj1, obj2); // true (objects are equal)

Lodash brute-force compares each key-value pair, employing ECMAScript 5 optimizations for performance. Note that this answer previously recommended Underscore.js, but Lodash has surpassed it in terms of bug fixes and consistency.

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