Functions let you group a series of statements together to perform a specific task. If different parts of a script repeat the same task, you can reuse the function (rather than repeating the same set of statements).
To create a function, you give it a name and then write the statements needed to achieve its task inside the curly braces. This is known as a function declaration.
Function-keyword Function-Name(){ function-body; }
functions exchange information by means of parameters and arguments.
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- parameter : declaration within the parentheses following the function name in a function declaration or definition;
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- argument refers to any expression within the parentheses of a function call.
We say that a program or a section of code “calls” a function. This means that we want to execute the code in the function. A function may “return” a value. This means that the calling statement will receive some result from the function when the function execution is complete.
When you write a function you expect it to provide you with an answer, the response is known as a return value.
