JavaScript Array Tutorial | Empty an Array in JavaScript

In this tutorial, I will show you 4 different ways to make an array empty in JavaScript. Learn the four ways to empty an array in JavaScript.

1. Assigning it to a new empty array
2. Setting its length to zero
3. Using splice() method
4. Using pop() method

Suppose you have the following array and want to remove all of its elements:

let a = [1,2,3];

The following shows you several methods to make an array empty.

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1) Assigning it to a new empty array

This is the fastest way to empty an array:

a = [];

This code assigned the array a to a new empty array. It works perfectly if you do not have any references to the original array.

See the following example:

let b = a;
a = [];
console.log(b); // [1,2,3]

In this example, first, the b variable references the array a. Then, the a is assigned to an empty array. The original array still remains unchanged.

2) Setting its length to zero

The second way to empty an array is to set its length to zero:

a.length = 0;

The length property is read/write property of an Array object. When the length property is set to zero, all elements of the array are automatically deleted.

3) Using splice() method

The third way to empty an array is to remove all of its elements using the splice() method as shown in the following example:

a.splice(0,a.length);

In this solution, the splice() method removed all the elements of the a array and returned the removed elements as an array.

4) Using pop() method

The fourth way to empty an array is to remove each element of the array one by one using the while loop and pop() method:

while(a.length > 0) {
    a.pop();
}

This solution is quite trivial and is the slowest one in terms of performance.

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Learn JavaScript Arrays

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Now Learn JavaScript Programming Language With Microsoft

icrosoft has released a new series of video tutorials on YouTube for novice programmers to get a hands-on renowned programming language — JavaScript.

This isn’t the first attempt by Microsoft to come up with video tutorials by beginner programmers. The company also has a series of YouTube tutorials on Python for beginners.

For JavaScript, Microsoft has launched a series of 51 videos as ‘Beginner’s Series to JavaScript,’ for young programmers, developers and coders who are interested in building browser applications using JavaScript. These video tutorials will also help programmers and coders to use relevant software development kits (SDKs) and JavaScript frameworks, such as Google’s Angular.

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“Learning a new framework or development environment is made even more difficult when you don’t know the programming language,” stated on the Microsoft Developer channel on YouTube. “Fortunately, we’re here to help! We’ve created this series of videos to focus on the core concepts of JavaScript.”

It further stated — while the tutorials don’t cover every aspect of JavaScript, it indeed will help in building a foundation from which one can continue to grow. By the end of this series, Microsoft claims that the novice programmers will be able to work through tutorials, quick starts, books, and other resources, continuing to grow on their own.

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JavaScript Shopping Cart - Javascript Project for Beginners

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Fill and Filter in Array in JavaScript

By the word Array methods, I mean the inbuilt array functions, which might be helpful for us in so many ways. So why not just explore and make use of them, to boost our productivity.

Let’s see them together one by one with some amazing examples.

Array.fill():

The _fill()_ method changes all elements in an array to a static value, from a start index (default _0_) to an end index (default _array.length_). It returns the modified array.

In simple words, it’s gonna fill the elements of the array with whatever sets of params, you pass in it. Mostly we pass three params, each param stands with some meaning. The first param value: what value you want to fill, second value: start range of index(inclusive), and third value: end range of index(exclusive). Imagine you are going to apply this method on some date, so that how its gonna look like eg: array.fill(‘Some date’, start date, end date).

NOTE: Start range is inclusive and end range is exclusive.

Let’s understand this in the below example-

//declare array
var testArray = [2,4,6,8,10,12,14];

console.log(testArray.fill("A"));

When you run this code, you gonna see all the elements of testArray will be replaced by 'A' like [“A”,"A","A","A","A","A","A"].

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JavaScript Tutorial for Beginners: Learn JavaScript in 1 Hour

Watch this JavaScript tutorial for beginners to learn JavaScript basics in one hour.
avaScript is one of the most popular programming languages in 2019. A lot of people are learning JavaScript to become front-end and/or back-end developers.

I’ve designed this JavaScript tutorial for beginners to learn JavaScript from scratch. We’ll start off by answering the frequently asked questions by beginners about JavaScript and shortly after we’ll set up our development environment and start coding.

Whether you’re a beginner and want to learn to code, or you know any programming language and just want to learn JavaScript for web development, this tutorial helps you learn JavaScript fast.

You don’t need any prior experience with JavaScript or any other programming languages. Just watch this JavaScript tutorial to the end and you’ll be writing JavaScript code in no time.

If you want to become a front-end developer, you have to learn JavaScript. It is the programming language that every front-end developer must know.

You can also use JavaScript on the back-end using Node. Node is a run-time environment for executing JavaScript code outside of a browser. With Node and Express (a popular JavaScript framework), you can build back-end of web and mobile applications.

If you’re looking for a crash course that helps you get started with JavaScript quickly, this course is for you.

⭐️TABLE OF CONTENT ⭐️

00:00 What is JavaScript
04:41 Setting Up the Development Environment
07:52 JavaScript in Browsers
11:41 Separation of Concerns
13:47 JavaScript in Node
16:11 Variables
21:49 Constants
23:35 Primitive Types
26:47 Dynamic Typing
30:06 Objects
35:22 Arrays
39:41 Functions
44:22 Types of Functions

📺 The video in this post was made by Programming with Mosh
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