JavaScript Tutorial - W3Schools
Why Study JavaScript? JavaScript is one of the 3 languages all web developers must learn: 1. HTML to define the content of web pages. 2. CSS to specify the layout of web pages. 3. …
JavaScript Functions - W3Schools
A JavaScript function is a block of code designed to perform a particular task. A JavaScript function is executed when "something" invokes it (calls it).
JavaScript Examples - W3Schools
Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, Python, PHP, Bootstrap, Java, XML and more.
JavaScript Arithmetic - W3Schools
JavaScript Arithmetic Operators. Arithmetic operators perform arithmetic on numbers (literals or variables).
JavaScript Form Validation - W3Schools
JavaScript Form Validation. HTML form validation can be done by JavaScript. If a form field (fname) is empty, this function alerts a message, and returns false, to prevent the form from …
JavaScript Operators Reference - W3Schools
JavaScript Operators. Operators are used to assign values, compare values, perform arithmetic operations, and more. There are different types of JavaScript operators: Arithmetic Operators; …
JavaScript Switch Statement - W3Schools
The JavaScript Switch Statement. Use the switch statement to select one of many code blocks to be executed. Syntax
JavaScript For Loop - W3Schools
JavaScript supports different kinds of loops: for - loops through a block of code a number of times; for/in - loops through the properties of an object; for/of - loops through the values of an iterable …
JavaScript Arrays - W3Schools
Arrays are a special type of objects. The typeof operator in JavaScript returns "object" for arrays. But, JavaScript arrays are best described as arrays. Arrays use numbers to access its …
JavaScript Data Types - W3Schools
Most programming languages have many number types: Whole numbers (integers): byte (8-bit), short (16-bit), int (32-bit), long (64-bit) Real numbers (floating-point): float (32-bit), double (64 …