What does the i--> opeator do in JavaScript?

Question

So I took a look at the code that controls the counter on the SO advertising page. Then I saw the line where this occured i-->. What does this do?

He

Answer 1

i-->0 is the same as i-- > 0, so the comparison expression if the evaluated value of i-- is greater than 0.

Answer 2

Other answers have explained that it's two operators. I'll just add that in the example, it's unnecessary. If you're counting down from a positive integer to zero, you can miss out the greater-than-zero test and your code will be shorter and, I think, clearer:

var i = 10;
while (i--) {
    // Do stuff;
}

Answer 3

Thought of the exact same thread that JCasso thought of. What is the "-->" operator in C++?

I think this code style stems from the early days of programming when terminals had limited display real estate.

Answer 4

it is not an operator. See this link:

What is the "-->" operator in C++?

var i = 10;

while (i-- > 0)
{
   alert('i = ' + i);
}

Output:

i = 9 
i = 8 
i = 7 
i = 6 
i = 5 
i = 4 
i = 3 
i = 2 
i = 1 
i = 0