Jul 8, 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 take some input and …

What is a Function? A function relates an input to an output. It is like a machine that has an input and an output. And the output is related somehow to the input.

When Should I Use a Function? If a part of your program does a specific task, you should create a function for it. It is especially useful to create a function if you need to run that code more than …

A JavaScript callback is a function passed as an argument to another function, which is then executed (or "called back") at a later point in time to complete a specific task.

Jul 8, 2025 · The Function() constructor, function expression, and function declaration syntaxes create full-fledged function objects, which can be constructed with new. However, arrow functions and …

The concept of a function was formalized at the end of the 19th century in terms of set theory, and this greatly increased the possible applications of the concept. A function is often denoted by a letter …

Oct 6, 2025 · A function is a special relation or method connecting each member of set A to a unique member of set B via a defined relation. Set A is called the domain, and set B is called the co-domain …

The simplest definition is: a function is a bunch of ordered pairs of things (in our case the things will be numbers, but they can be otherwise), with the property that the first members of the pairs are all …

Jan 13, 2026 · Function, in mathematics, an expression, rule, or law that defines a relationship between one variable (the independent variable) and another variable (the dependent variable). Functions …

Uh oh, it looks like we ran into an error. You need to refresh. If this problem persists, tell us. A function is like a machine that takes an input and gives an output. Let's explore how we can graph, analyze, …