JavaScript for…in vs for

Question

Do you think there is a big difference in for...in and for loops? What kind of \"for\" do you prefer to use and why?

Let\'s say we have an array of associative array

Answer 1

If you really want to speed up your code, what about that?

for( var i=0,j=null; j=array[i++]; foo(j) );

it's kinda of having the while logic within the for statement and it's less redundant. Also firefox has Array.forEach and Array.filter