Using var keyword

Question

What is the difference between using a variable declared with the var keyword and not declaring it with var? example: var x = 5; x = 5;

Answer 1

No!!! Better search on Google...

Answer 2

If you don't initialize it with var, JS will assume it's an already existing variable and upon value assigning it'll throw an error if it's not instantiated/initialized.

Answer 3

I think so...

Answer 4

Indeed but y is local now, try accessing it within a function while y is outside like this.

Answer 5

well i thought of that, but i've never had any problem when i removed "var". does using a variable without var only work in a function body?

Answer 6

it doesn't make any difference at all ... both works as expected. check out my code

Answer 7

there is no problem accessing y in a function. i mean var makes your code cleaner because you see when it gets declared but is that really the only difference?!