Arrays: Number of items in an array

You can get the number of elements in the array by checking its length property:

const a = [1, 2, 3]
a.length //3

0:	Introduction
1:	▶︎ Number of items in an array
2:	Create a new array from an existing array
3:	Adding an item to an existing array
4:	Adding at the beginning of an array
5:	Adding multiple items to the array
6:	Removing an item from an array
7:	Modifying an existing array without mutating it
8:	Arrays of arrays
9:	Filling an array
10:	Array destructuring
11:	Check if an array contains a specific value