How Type Coercion in JavaScript Works

Truthy and falsy values are important for JavaScript developers to understand. Learn what truthy and falsy values are and how they work.

In JavaScript, you can convert a value from one type to another. This is called type coercion. Type coercion is one of the topics that can be hard to understand. This tutorial will help you with it. It will show you what it is, how it works, and how to use it to become a better JavaScript developer.

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Type Coercion in JavaScript

Type coercion means that when the operands of an operator are different types, one of them will be converted to an “equivalent” value of the other operand’s type. For instance, if you do:

boolean == integer

the boolean operand will be converted to an integer: false becomes 0, true becomes 1. Then the two values are compared.

However, if you use the non-converting comparison operator ===, no such conversion occurs. When the operands are of different types, this operator returns false, and only compares the values when they’re of the same type.

Type coercion is the process of converting value from one type to another (such as string to number, object to boolean, and so on). Any type, be it primitive or an object, is a valid subject for type coercion. To recall, primitives are: number, string, boolean, null, undefined + Symbol (added in ES6).

Implicit vs. explicit coercion Type coercion can be explicit and implicit.

When a developer expresses the intention to convert between types by writing the appropriate code, like Number(value), it’s called explicit type coercion (or type casting).

Since JavaScript is a weakly-typed language, values can also be converted between different types automatically, and it is called implicit type coercion. It usually happens when you apply operators to values of different types, like 1 == null, 2/’5', null + new Date(), or it can be triggered by the surrounding context, like with if (value) {…}, where value is coerced to boolean.

One operator that does not trigger implicit type coercion is ===, which is called the strict equality operator. The loose equality operator == on the other hand does both comparison and type coercion if needed.

Implicit type coercion is a double edge sword: it’s a great source of frustration and defects, but also a useful mechanism that allows us to write less code without losing the readability.

Three types of conversion The first rule to know is there are only three types of conversion in JavaScript:

• to string
• to boolean
• to number

Secondly, conversion logic for primitives and objects works differently, but both primitives and objects can only be converted in those three ways.

Let’s start with primitives first.

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What is JavaScript - Stackfindover - Blog

Who invented JavaScript, how it works, as we have given information about Programming language in our previous article ( What is PHP ), but today we will talk about what is JavaScript, why JavaScript is used The Answers to all such questions and much other information about JavaScript, you are going to get here today. Hope this information will work for you.

Who invented JavaScript?

JavaScript language was invented by Brendan Eich in 1995. JavaScript is inspired by Java Programming Language. The first name of JavaScript was Mocha which was named by Marc Andreessen, Marc Andreessen is the founder of Netscape and in the same year Mocha was renamed LiveScript, and later in December 1995, it was renamed JavaScript which is still in trend.

What is JavaScript?

JavaScript is a client-side scripting language used with HTML (Hypertext Markup Language). JavaScript is an Interpreted / Oriented language called JS in programming language JavaScript code can be run on any normal web browser. To run the code of JavaScript, we have to enable JavaScript of Web Browser. But some web browsers already have JavaScript enabled.

Today almost all websites are using it as web technology, mind is that there is maximum scope in JavaScript in the coming time, so if you want to become a programmer, then you can be very beneficial to learn JavaScript.

JavaScript Hello World Program

In JavaScript, ‘document.write‘ is used to represent a string on a browser.

<script type="text/javascript">
	document.write("Hello World!");
</script>

How to comment JavaScript code?

• For single line comment in JavaScript we have to use // (double slashes)
• For multiple line comments we have to use / * – – * /

<script type="text/javascript">

//single line comment

/* document.write("Hello"); */

</script>

Advantages and Disadvantages of JavaScript

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Hire Dedicated JavaScript Developers -Hire JavaScript Developers

It is said that a digital resource a business has must be interactive in nature, so the website or the business app should be interactive. How do you make the app interactive? With the use of JavaScript.

Does your business need an interactive website or app?

Hire Dedicated JavaScript Developer from WebClues Infotech as the developer we offer is highly skilled and expert in what they do. Our developers are collaborative in nature and work with complete transparency with the customers.

The technology used to develop the overall app by the developers from WebClues Infotech is at par with the latest available technology.

Get your business app with JavaScript

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The essential JavaScript concepts that you should understand

As a JavaScript developer of any level, you need to understand its foundational concepts and some of the new ideas that help us developing code. In this article, we are going to review 16 basic concepts. So without further ado, let’s get to it.

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Data Types In JavaScript

JavaScript data types are kept easy.

While JavaScript data types are mostly similar to other programming languages; some of its data types can be unique. Here, we’ll outline the data types of JavaScript.

Firstly, JavaScript data types are separated into three; primitive, composite (reference), and special data types. Before going to data types of JavaScript, let’s begin with their definitions.

Primitive

The most basic data type in JavaScript where it does not require any complex statement. Number, string, and boolean are known to be primitive data types.

Composite (reference)

Composite data types are made up of heterogeneous data as a unit. They can contain every data types including other composite values in JavaScript. They’re objects, arrays, and functions.

Numbers

Numbers are simply floats and integers in JavaScript. When we define integers, they’re numbers without decimal points (for example 9). And floats can be defined as numbers with a decimal point in JavaScript (for example 3.4).

String

Similar to other programming languages, strings are textual data being represented as a single or double quotes surrounding one or more characters.

Booleans

Similar to other programming languages; booleans are used to check whether statements are true or false. It’s generally used to check the validity of statements in JavaScript and all other programming languages out there.

Arrays

Arrays are a type of object used for storing multiple variables in a single variable. Each one is called an element and arrays start with 0.

Functions

Similar to other programming languages; functions give the output in a simple matter. And there are lots of built-in functions in JavaScript that gives you the output you need to execute a block of code if the statements are written correctly. They can be assigned to variables as they’re objects at the same type.

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