Lesson

10.13Array Length

We can use .length to get the number of elements in an array, also known as the length of the array.

In the example given above:

The fruits array initially contained 2 elements.
We then added another element to the index 2 and hence the length of the array was increased by one.

In the example given above:

The sports array initially contained 5 elements.
Then another element was added to the index 9. As we saw in the previous chapter, this means that all the indexes from 5 to 8 will contain the value undefined.
After that, when we checked the value of sports.length, we got the value 10 because even the undefined elements were counted.