Here is some of my javascript:

(function(window) {
  window.file = {};
  file.i = 0;
  
  for(;;) {
     if(file.i++ >= 10) break;
     document.body.appendChild(document.createTextNode(file.i))
  } 
  
 
}) ();

Here is some of my javascript:

(function(window) {
  window.file = {};
  file.i = 0;
  
  for(;;) {
     if(file.i++ >= 10) break;
     document.body.appendChild(document.createTextNode(file.i))
  } 
  
 
}) ();

Why is window undefined?

• javascript
• undefined

• window is supposed to be the global object. You probably wouldn't need to pass it to function. Also note that document is a property of window. – frogatto Commented Jan 21, 2019 at 19:42
• I do that so it is more readable, and sometimes i like to pass a different object rather than window. – chuck Commented Jan 21, 2019 at 19:45

2 Answers 2

You need to call the anonymous function with window as the first argument:

(function(window) {
  window.file = {};
  file.i = 0;
  
  for(;;) {
     if(file.i++ >= 10) break;
     document.body.appendChild(document.createTextNode(file.i))
  } 
}) (window);

Since you provided nothing, window inside of your function's scope was considered undefined.

Try

(function(window) {
  window.file = {};
  file.i = 0;
  
  for(;;) {
     if(file.i++ >= 10) break;
     document.body.appendChild(document.createTextNode(file.i))
  } 
  
 
})(window);