How to understand the concept of functions in javascript

Grammar format:

function functionname()
 {
     // execute code
 }

function is a keyword used to define a function.

Note: Javascript is case sensitive. The keyword function must be lowercase, and the function must be called with the same case as the function name.

Function with parameters

Grammar format:

function myFunction(var1,var2)
 {
 the code
 }

Example:

A parameter with a return value

The return value is realized by the return statement .

Grammar format:

function myFunction()
 {
     var x=5;
   return x;
 }

Note: Using the return statement does not mean that the entire Javascript stops executing, only the function. Javascript will continue to execute the code from where the function was called.

Example:

Recommended tutorial: js introductory tutorial

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