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var x = "hello "
var my_closure = function (y) {
  alert(x + y);
}
my_closure("world");

for (@some_array) {
  # Declaring this in the loop creates a new variable per
...
  };
}
# We now have one closure per array element.

for (var i = 0; i < some_array.length; i++) {
  // Declaring this in the loop creates a one variable for
...
  });
}
// All closures now point at the last element.

for (var i = 0; i < some_array.length; i++) {
  // This declares and immediately calls a function, and x
...
  )(some_array[i]); // And here is where we bind the value.
}
// We now have one closure per array element.