Array Methods and Properties
Overview of JavaScript methods and properties.
Introduction
Array objects, like other objects, have methods and properties that let you modify or query them onto the object. These methods and properties make it easy to manage data. It is more convenient to use arrays rather than creating custom objects.
Properties of an array
The property of an array is a quality or attribute of the array. This could be the length, memory size, or any other quality. These are usually static values updated with the array. They may also be used to change a certain quality of the object.
So let’s take a look at some important properties available to us through JavaScript.
> length
The length property, a widely used property, tells you the current length of the array. Since this property is updated as the array is updated, there is no computation overhead when this property is called upon.
Let’s see this in action.
var arr1 = [1, 2, 3, 4, 5]; // assign array of 5 elements to arr1var arr2 = new Array(100); // assign an array of size 100 to arr2var arr3 = new Array(9, 10); // assign array with 2 eleements to arr3console.log(`arr1 size:`, arr1.length); // print length of arr1console.log(`arr2 size:`, arr2.length); // print length of arr2console.log(`arr3 size:`, arr3.length); // print length of arr3