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JavaScript by Example, Second Edition by Ellie Quigley

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Chapter 7. Functions

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7.1 What Is a Function?

A pocket calculator performs certain functions. You push the buttons, send information to the calculator, it performs a calculation, and sends back the results. You don’t care about what transpires inside the calculator, you just want the results. That’s what a function does. Functions are self-contained units of a program designed to accomplish a specified task such as calculating mortgage payments, displaying random images, or checking for valid input. They can be used over and over again and thus save you from repetitious programming. They are also used to break up a program into smaller modules ...

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