Functions in code

Named, reusable blocks of code that take inputs (parameters) and produce outputs (return values).

Depth 1 · Foundation

You can define and call functions, pass arguments and use return values.

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Depths of understanding

1
Foundation
You can define and call functions, pass arguments and use return values.
- Read itFunctionsIntroduction to Go
Opens after
Input and outputA function is a small program of its own, so it helps to have written whole programs that read input and print results first.
2
Deeper
You can tell a pure function - same input, same output, no side effects - from one that isn't, and why pure functions are math's functions.
Master depth 1 first
FunctionsThe mathematical idea of a function - one output per input - is the yardstick for what makes code predictable.Return valuesA pure function's whole effect is the value it returns, so you need to know return well before you can tell pure from impure.

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