Var names with undefinied

JavaScript
1

What is that situation when only need set a
var thisone; // this means undefined
in some codes see that is have used. What ways need to be set var like this? I think because if you set var thisone = 1; not will work.

2

they are both valid ways of defining and initializing a variable.
Define with
var thisone;
Define and initialize with
var thisone = 1;

Both are valid and have their own uses.

3

And what about

var thisone;

and init with thisone = 1;

I saw this one in a count script. So this works with count or something?

4

yes, of course another usage is
var thisone;
thisone = “anything I want!”;

The second line initializes the value of thisone to whatever you want.
There are a million ways to use these variables and these initializations.

Keep coding and you will learn more…

5

I see on many sites. Copy paste js code and know nothing about it. Just try to understand what i am doing.

6

sure thing. I’m sorry if my explanation is not helping.
If you wish you can also google your question and find lots of resources on javascript variables and their usage.

7

var thisone; creates new variable called thisone that can hold some value be it a integer floating point number, string object, or boolean. All it is space to hold something. Until you give it something hold the value is undefined. When you use the = sign to to assign it to something be it a number, string object or another variable then it holds that value. Also your variable thisone should be named “thisOne”. If you don’t know what thisone will hold the write " var thisone;" if you know what thisone should hold (you can change it later) write “var thisone= somthing;”