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Inserting an element at the end of the array
If we want to add a new element to this array (for example, the number 10), all we have to do is reference the latest free position of the array and assign a value to it:
numbers[numbers.length] = 10;
In JavaScript, an array is a mutable object. We can easily add new elements to it. The object will grow dynamically as we add new elements to it. In many other languages, such as C and Java, we need to determine the size of the array, and if we need to add more elements to the array, we need to create a completely new array; we cannot simply add new elements to it as we need them.