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What you need to know about variable scope What is a user-defined variable in JavaScript? All JavaScript programming happens in an environment like a web browser, Node, or Bun.js.

Ordinarily with JavaScript, you can change pretty much any variable you want. Any variable you declare can be reassigned to any other value, unless you use the const keyword.

Master JavaScript programming with this complete beginner’s tutorial. Learn the fundamentals of JavaScript, a versatile programming language.

JavaScript Typing Unlike strongly typed programming languages such as C#, JavaScript is loosely typed and allows you to assign any data type to a variable without giving the variable a specific type.