Iterating Arrays

In this lesson, we will see how loops iterate arrays, where iterate means accessing elements in the array one by one.

Iterating single-dimensional arrays

To iterate a single dimension array, we design a loop that will index each element and terminate when the end is reached. Take for example the following array:

var arr = [ 10, 25, 7, 100, 20 ];

To iterate it, we start off with the first element (index 0) and end at the last element (index 4).