What does "function" mean in programming?

function is one of the most common terms in software development. This guide explains what it means, how it is used in practice, and why it matters, with real examples from the developer world.

Definition

A named, reusable block of code that performs a specific task. Functions take inputs (parameters), execute logic, and optionally return an output. They are the fundamental unit of code reuse.

Example

"Extract the validation logic into a function that can be called from multiple places."

Related terms

method
class
variable
recursion
module

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