JavaScript Core Concepts -Function and Comments

What Is Comment

The comment is a readable explanation for the source code of any computer program. Comment used to make the source code easier for other humans to understand that properly.

Why Comment

> Comments make code more readable and understandable.
> Useful for a large team with lots of people.
> Recall projects part after a log of time.
> Add some design to your project’s code.
> It will attract the person who is watching your codes.

Types of comments

There are two types of comment.
1. Single-Line Comments
2. Multi-line Comments

Single Line Comments

Single line comments start with //. Any text between // and the end of the line will be declared as a comment.
First, place your cursor where you’d like to add the comment.
Then, use the VS Code comment shortcut :

If you want to comment a part of line, then simple add // at the starting point. If you hit CTRL + / , the full line will be comment.

When you will hit enter the comments system will be stooped and basic code will be started. So, if you want to add multi-line comments, you need to comments on the other lines again.

Multi Line Comments

Multi line comments start with /* and end with */. Any text between /* and */ will be declared as a comment.
Add */ at the starting and /* at the end.

# Most of the people use Single-Line Comments.

Function

Function is a process of naming some work together and call them when it is necessary with the name. With function you can set the function/work of any element. Then when you will call the element, it will do its functional works.

Function | Note It

> In loop, the all elements/work comes at a time. but, in function when & where you call it, it will be come/start working.

> JS function can declared under a variable. For that, Js function called First Class Function.

> Function is a object in JavaScript. So you can use it as a object. Object can use as a parameter of a function. So, function can also use as a parameter of other function.

> You can declare a function inside another function. Because function is a object.