// Log all pairs of array i.e. [1,1], [1,2] [1,3] [2,1] [2,2] etc const boxes = [1,2,3,4,5]; function logArrayPairs(array) { for (let i = 0; i < array.length; i++) { for (let j = 0; j < array.length; j++) { console.log(array[i], array[j]) } } } logArrayPairs(boxes); // O(n) * O(n) = O(n^2) : Quadratic times // nested is multiplied