Javascript - Function Functions Definition

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Introduction

Functions in ECMAScript are declared using the function keyword, followed by a set of arguments and the body of the function.

The basic syntax is as follows: 

function functionName(arg0, arg1,...,argN) {
    statements
}

Here's an example: 

function displayMessage(name, message) {
    console.log("Hello " + name + ", " + message);
}

This function can be called by using the function name, followed by the function arguments enclosed in parentheses.

To call the displayMessage() function: 

displayMessage("reader", "how are you today?");