How to Compare an Array of Numbers in JavaScript

To check if two arrays of numbers are identical, you can use the every() function as shown below.

const array1 = [1, 1, 1, 1, 1];
const array2 = [1, 1, 1, 1, 1];
const array3 = [1, 2, 3, 4, 5, 6];

function numberArrayEquals(array1, array2) {
  return array1.length === array2.length &&
    array1.every((v, i) => array2[i] == array1[i]);
}

numberArrayEquals(array1, array2); // true
numberArrayEquals(array1, array3); // false

Alternative Using JSON.stringify()

You can also use JSON.stringify() to check if the two arrays are identical.

const array1 = [1, 1, 1, 1, 1];
const array2 = [1, 1, 1, 1, 1];
const array3 = [1, 2, 3, 4, 5, 6];
// JSON.stringify(array1) => "[1,1,1,1,1]"
JSON.stringify(array1) === JSON.stringify(array2); // true
JSON.stringify(array1) === JSON.stringify(array3); // false

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