for (var i = 0; i < some_array.length; i++) {
  // This declares and immediately calls a function, and x
  // is scoped to that function call.
  (function (x) {
     closures.push(function () {
      // Do something using x.  I'll just return it.
      return x;
    });
  )(some_array[i]); // And here is where we bind the value.
}
// We now have one closure per array element.