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JavaScript functions
JavaScript functions group a piece of work so it can be used again. They help give a program structure instead of repeating the same instructions in several places.
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An app might calculate a total in more than one screen or prepare the same kind of message for different people. Reusable operations help keep those behaviours consistent.
Inputs and results connect pieces of behaviour
A function gives a piece of behaviour a defined role. It may receive information, perform work, and return a result that another part of the program uses. The function that calculates a total does not have to be the part that displays it.
This separation matters when the same result appears in different places. A summary screen and a checkout screen can depend on the same calculation while presenting it differently. Functions make those shared responsibilities easier to recognise in a growing interface.
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