How to compare arrays in JavaScript?

by

I’d like to compare two arrays… ideally, efficiently. Nothing fancy, just true if they are identical, and false if not. Not surprisingly, the comparison operator doesn’t seem to work.

var a1 = [1,2,3];
var a2 = [1,2,3];
console.log(a1==a2);    // Returns false
console.log(JSON.stringify(a1)==JSON.stringify(a2));    // Returns true

JSON encoding each array does, but is there a faster or “better” way to simply compare arrays without having to iterate through each value?

7
75

Leave a Comment