Declaration & Invoke - 01

Function : 

A JavaScript function is a reusable block of code that groups together a sequence of statements to perform a particular task. 

Function declarations :

JavaScript function declaration starts with… 

• The function keyword, 

• Parentheses are used next to the name of the function or its identifier, 

• A function body or the block of statements enclosed in curly braces.

Here,
() : between the parentheses contains single or multiple parameters separated by commas.
{}: between the curly braces is the function body or the JavaScript statement where a code block is to be executed.

Call or Invoke a function: 

Only function declaration will not execute or run the code inside the function body. Function declaration means to declare the existence of a function.

If we want to execute or run the code inside a function body, then we have to call a function in our code by typing the function name followed by parentheses.