JavaScript string Summary: in this tutorial, you’ll learn about the JavaScript string primitive type and how to use it to define strings. Introduction to the JavaScript strings JavaScript strings are primitive values. Also, strings are immutable. It means that if you modify a string, you will always get a new string. The original string doesn’t…
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JavaScript boolean type Summary: in this tutorial, you’ll learn about the JavaScript boolean type that has two literal values true and false. Introduction to the JavaScript boolean type The JavaScript boolean primitive type has two literal values: true and false. The following example declares two variables and initializes their values to true and false: let…
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A Quick Look at Octal and Binary Literals in ES6 Summary: in this tutorial, you will learn how to represent the octal and binary literals in ES6. ES5 provided numeric literals in octal (prefix 0), decimal (no prefix), and hexadecimal (0x). ES6 added support for binary literals and changed how it represents octal literals. Octal…
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JavaScript Numeric Separator Summary: in this tutorial, you’ll how to use the JavaScript numeric separator to make the numeric literals more readable. Introduction to the JavaScript numeric separator The numeric separator allows you to create a visual separation between groups of digits by using underscores (_) as separators. For example, the following number is very…
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JavaScript Numbers Summary: in this tutorial, you’ll learn about the JavaScript number types and how to use them effectively. Introduction to the JavaScript Number JavaScript uses the number type to represent both integers and floating-point values. Technically, the JavaScript number type uses the IEEE-754 format. ES2020 introduced a new primitive type bigint representing big integer…
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JavaScript Data Types Summary: in this tutorial, you will learn about the JavaScript data types and their unique characteristics. JavaScript has the primitive data types: null undefined boolean number string symbol – available from ES2015 bigint – available from ES2020 and a complex data type object. JavaScript is a dynamically typed language. It means that…
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JavaScript Variables Summary: in this tutorial, you’ll learn about JavaScript variables and how to use variables to store values in the application. A variable is a label that references a value like a number or string. Before using a variable, you need to declare it. Declare a variable To declare a variable, you use the…
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JavaScript Syntax Summary: in this tutorial, you will learn about JavaScript syntax, including whitespace, statements, identifiers, comments, expressions, and keywords. Whitespace Whitespace refers to characters that provide the space between other characters. JavaScript has the following whitespace: Carriage return Space New Line tab JavaScript engine ignores whitespace. However, you can use whitespace to format the…
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JavaScript Hello World Example Summary: This tutorial helps you get started with JavaScript by showing you how to embed JavaScript code into an HTML page. To insert JavaScript into an HTML page, you use the <script> element. There are two ways to use the <script> element in an HTML page: Embed JavaScript code directly into…
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Web Development Tools Summary: in this tutorial, you will learn how to open the Console tab of web development tools to view the messages. Web development tools allow you to test and debug the JavaScript code. Web development tools are often called devtools. Modern web browsers such as Google Chrome, Firefox, Edge, Safari, and Opera…
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