Web Reference: Computing the difference between two arrays is one of the Set operations. The term already indicates that the native Set type should be used, in order to increase the lookup speed. Jul 23, 2025 · To find the difference between two arrays in JavaScript, you can iterate over one array using a for loop and check if each element exists in the other array using the indexOf () method. In this post we’re going to take on a coding challenge where the objective is to create a function that accepts an array of integers and sums the difference between the consecutive pairs in the array.
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