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Vocabulary

Understand the term. Connect the concept.

A practical dictionary of 512 AI, machine learning, mathematics, and programming terms from HerbDev’s AI Vocabulary app. Start with a definition, explore an example, then follow the concepts behind it.

Linked concepts open in a new tab. Audio reads the definition and example.

Function

Functions & Programming Concepts · Level 1 of 5

Function

A rule or callable that maps inputs to outputs or performs a computation.

Mathematical functions assign one output to each valid input; program functions may also have side effects.

Example

A routine accepts two numbers and returns their sum.

Listen to the definition and example

Audio transcript

Function. A rule or callable that maps inputs to outputs or performs a computation. Mathematical functions assign one output to each valid input; program functions may also have side effects. For example: A routine accepts two numbers and returns their sum.

Explore this concept

A useful analogy

A machine with an input contract and a specified way to produce a result.

Why it matters

This helps you distinguish a computation’s contract, inputs, outputs, and behavior.

Technical detail

A mathematical f: X → Y assigns exactly one y to each x in X. Program callables may instead mutate state, throw errors, or not terminate.

Common misconception

Not every programming function is a pure mathematical mapping.

Related concepts

Quick recall question

Try answering before looking back at the definition.

Put the terminology into context: How AI works · Machine-native representations · All learning paths

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