A JavaScript function is defined with the function keyword, followed by a name, followed by parentheses (). Function names can contain letters, digits, underscores, and dollar signs …

JavaScript functions are defined with the function keyword. You can use a function declaration or a function expression. Earlier in this tutorial, you learned that functions are declared with the …

Mar 22, 2025 · A function in JavaScript is similar to a procedure—a set of statements that performs a task or calculates a value, but for a procedure to qualify as a function, it should …

JavaScript variables have 3 types of scope: Before ES6 (2015), JavaScript variables had only Global Scope and Function Scope. ES6 introduced two important new JavaScript keywords: …

Jan 18, 2019 · I am trying to understand storing a function as a variable. If I have the following function: return 2 * 2 . I know that the variable test has the value of 4, which makes sense. …

Apr 15, 2025 · Functions in JavaScript are reusable blocks of code designed to perform specific tasks. They allow you to organize, reuse, and modularize code. It can take inputs, perform …

Jan 29, 2025 · Variables in JavaScript can be declared using var, let, or const. JavaScript is dynamically typed, so variable types are determined at runtime without explicit type definitions. …

Jul 15, 2024 · In JavaScript, every function is actually a Function object. Creates a new Function object. Calling the constructor directly can create functions dynamically but suffers from …

Feb 10, 2025 · When a variable is declared using var, it is function-scoped or globally-scoped, depending on where it is declared. Syntax. It declares a variable using var, assigns it a value, …

Here's a quick example of function and function expression. You can read the rest of the tutorial for more. console.log("Hello World!"); // store a function in the displayPI variable // this is a …