Naming a chunk of work so you (and your AI) can reuse it.
Sam's coffee-run script has grown. The pricing maths (£3.50 base, 60p a shot) now appears in four different places, and yesterday she fixed a mistake in three of them. The fourth is still wrong, somewhere.
Her AI: "You keep re-describing the same work. Name it once, then just use the name." That's a function, and Sam has technically already met one. Her very first night, she asked what return does. Tonight it all clicks.
Check your intuition
The AI shows her a tiny one: function greet(name) { return "Hi, " + name + "!"; }, then calls it twice: greet("Sam") and greet("Priya"). Before any theory: what comes back?
Anatomy, left to right: the keyword function, then the name (greet), then parameters in brackets: empty labelled slots. Then the braces: the body, where the work happens. And return (Sam's first-ever question, module 0, answered by the AI as "the comes-out part") hands the result back to whoever called.
Here's a single call in slow motion. Watch where the argument goes in, and where the value comes out.
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