Javascript

JavaScript Reserved Words

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JavaScript has a set of special words that have a predefined meaning in the language. These words are called reserved words or reserved keywords. Reserved words are part of JavaScript’s syntax and are used for specific purposes, such as creating variables, defining functions, controlling program flow, handling classes, working with asynchronous code, and managing errors. … Read more

JavaScript Identifiers

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JavaScript identifiers are the names used to identify variables, functions, classes, objects, and other elements in a JavaScript program. Whenever you create a variable, define a function, declare a class, or create certain other named elements, you give that element an identifier. For example: In this example, firstName is an identifier. It gives the variable … Read more

JavaScript Whitespace

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Whitespace is an important part of writing clean and readable JavaScript code. In JavaScript, whitespace generally refers to spaces, tabs, line breaks, and other formatting characters that separate or organize pieces of code. In many situations, JavaScript does not require extra spaces or line breaks for the program to work. The JavaScript engine can ignore … Read more

JavaScript Case Sensitivity

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JavaScript is a case-sensitive programming language, which means uppercase and lowercase letters are treated as different characters. When you write JavaScript code, the capitalization of variable names, function names, object properties, keywords, and many other identifiers matters. For example, JavaScript considers name, Name, and NAME to be three different identifiers: The output is: Although the … Read more

JavaScript Semicolons

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JavaScript semicolons are punctuation marks used to indicate the end of a statement in JavaScript code. A semicolon is represented by the ; character and is commonly placed at the end of JavaScript statements. In this example, each statement ends with a semicolon. The semicolons make it clear where one statement ends and the next … Read more

JavaScript Expressions

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JavaScript expressions are one of the fundamental building blocks of JavaScript programming. An expression is a piece of JavaScript code that can be evaluated to produce a value. Expressions are used throughout JavaScript programs to calculate numbers, combine strings, compare values, assign data to variables, call functions, access properties, and perform many other operations. When … Read more

JavaScript Comments

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JavaScript comments are notes written inside JavaScript code that are ignored by the JavaScript engine when the program runs. Developers use comments to explain what a particular section of code does, provide helpful information for other developers, temporarily disable code, and make larger programs easier to understand and maintain. Comments do not normally affect the … Read more

JavaScript Statements

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JavaScript statements are the instructions that tell a JavaScript program what to do. Just as a sentence in a human language communicates an idea, a JavaScript statement communicates an action or operation that the browser or JavaScript engine needs to perform. When you write JavaScript code, you usually combine multiple statements to create a complete … Read more

Setting Up JavaScript

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Learning JavaScript does not require a complicated setup. You can start writing and running JavaScript with a modern web browser and a code editor. JavaScript is commonly used with HTML and CSS to build interactive websites. HTML provides the structure.CSS controls the appearance. JavaScript adds logic, behavior, and interaction. For example, HTML can create a … Read more

How JavaScript works

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JavaScript is a programming language that allows websites and applications to perform actions. When you write JavaScript code, the browser does not simply display that code as text. A JavaScript engine reads the code, processes it, and executes the instructions. For example: When this code runs, the JavaScript engine processes the instructions and produces the … Read more