In this tutorial, you will learn how to find the number of elements in an array. You know that an array is a variable that holds multiple values. But actually, the array is an object, and it has various methods and properties. One such property is length.
Every array has a length property that returns the number of elements present in that array.
let arr = [7, 14, 21, 28, 35];
console.log(arr.length); //5
let indoorGames = Array.of('Chess', 'Table Tennis', 'Scrabble');
console.log(indoorGames.length); //3
One important thing about the length property that you must be aware of is that you can assign a numeric value to the length property. When you assign a number greater than the array's length to the length property, new elements are added to the array with an undefined value. But when you assign a number smaller than the array's length, the array is truncated.
let arr = [7, 14, 21, 28, 35]; console.log(arr.length); //5 arr.length=7; console.log(arr); //[7, 14, 21, 28, 35, undefined, undefined] arr.length = 3; console.log(arr); //[7, 14, 21]
