How does JavaScript deal with integers? when you need to count etc...

Answer 1

In JavaScript, they are called 'numbers'.
There's only one type of numbers, with or without decimals, short or long.. just numbers.
You need to be more specific about the counting part. There are tons of ways how you work with numbers in JS, just like in any other programming language.

Answer 2

your question is not specific. if you wanna count you can use a for loop with i+ parameter. if you wanna get an integer out of some number use Math.round () ... still your question can have 1000 answers till you specify more