setTimeout and setInterval extra arguments

gistfile1.md

Every single JavaScript engine supports standard timers *

These accept one or more extra argument by specs

for(var i = 0; i < 2; i++) {
  setTimeout(function (i) {
    console.log(i);
  }, 0, i); // <== see this?
}

You don't need an inline invoked function, you don't need to bind arguments, you just pass one or more parameter once and you are done.

• JScript (IE8 and lower) and IE9 are the only exception, all others since ever supports extra arguments, including IE10, 11, and Sparta. IE9 and 8 or lower browsers are very easy to fix in a completely unobtrusive way.

Using i in the inner function seems confusing, would it be better as something like this?

for(var i = 0; i < 2; i++) {
  setTimeout(function (j) {
    console.log(j);
  }, 0, i); // <== see this?
}

for(var i = 0; i < 2; i++) {
    setTimeout(function (ii) {
        console.log(ii);
    }.bind(null, i), 0);
}

This approach is easier for me to understand. Better browser support since it works in IE9, only needs a polyfill for IE8 and below. One thing to note is the changing of this context within the timed function.