A JavaScript function is a section of code created to carry out a certain purpose. When "something" calls a JavaScript function, it is carried out (calls it).
Syntax of JavaScript Functions
A JavaScript function's definition consists of the function keyword, a name, and parentheses (). Function names may also include underscores, dollar signs, and other characters (same rules as variables). Names of parameters may be included in parenthesis and separated by commas:
(parameter1, parameter2, ...)
Curly brackets enclose the code that the function will execute: {}
The function definition lists the function arguments between parentheses (). When a function is called, values are sent to it as arguments.
The arguments (the parameters) operate as local variables within the function.
let x = myFunction(4, 3); // Function is called, return value will end up in x
function myFunction(a, b) {
return a * b; // Function returns the product of a and b
}
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