ProLesson 3 of 36 min read

Functions: reusing code with parameters and return values

See how functions package code under a name, take inputs through parameters, and hand back results with return.

As programs grow, you notice the same few lines appearing again and again. Copying them is risky: if you find a bug, you must fix every copy. A function solves this. It packages a set of steps under a name so you can run them whenever you need, with different inputs each time.

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