Defining variables differences

[Marius Miliunas]

What's the difference between defining a variable with 'var' before, versus defining without it?

ex.

var s = 5;

Vs.

s = 5;

[griffinmt]

This may not be the complete reason, but declaring with the var insures it is local to the proceedure, defining it without var may take on the instance of a variable at a higher level that has the same name.

[Declan1991]

Yep. With var, it's local, without var if undefined, it's global. I personally dislike declaring variables like that, I think it's bad practice.