Functions in Javascript | How to create and use a function in Javascript

What is a function in Javascript.? How to create and use a function in Javascript. How to create a user defined function in js.
What is function in Javascript
How to create a function in js
How to use a function in Javascript
What is function in programming
How to make my own function
How to create user defined function
How functions work in programming
What is data type of a function

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