How to compare two arrays in Javascript

How many times have you found yourself having to verify if the contents of two arrays were equal? (It happens to me often)

Now I’ll show you two ways to solve this problem:

First approach: using JSON.stringify(), see more here

// `a` and `b` are arrays
const isEqual = (a, b) => JSON.stringify(a) === JSON.stringify(b);

// Examples
isEqual([1, 2, 3], [1, 2, 3]); // true
isEqual([1, 2, 3], [1, '2', 3]); // false

Second approach using every(), see more here

// `a` and `b` are arrays
const isEqual = (a, b) => a.length === b.length && a.every((v, i) => v === b[i]);
// Examples
isEqual([1, 2, 3], [1, 2, 3]); // true
isEqual([1, 2, 3], [1, '2', 3]); // false

That's all, hope you re enjoining it! 🙂

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