Re: "When closures capture their context" and "scope gotchas in Javascript"

If you want a new scope in javascript, you can achieve that with an anonymous function that you execute immediately.

// untested!
function sayHello(name){
  var sayAlert;
  var newScope = function() {
     var text = 'Hello' + name;
     sayAlert = function() { alert(text) }
  }
  newScope();
  var text = 'How confused am I?';
  sayAlert();
}
[download]

And that's why you want to program in perl, not in javascript (wherever possible).

Comment on Re: "When closures capture their context" and "scope gotchas in Javascript" Download Code

Replies are listed 'Best First'.

Re^2: "When closures capture their context" and "scope gotchas in Javascript"
by clinton (Priest) on Feb 08, 2008 at 16:36 UTC

moritz


   function sayHello(name) {
      var sayAlert;
      var text = 'Hello ' + name;
      sayAlert = function() { alert(text); }

      var new_text='How confused am I?';
      sayAlert();
    }

    sayHello('Bob');
[download]

Not a terribly meaningful example because I don't actually USE new_text, but...

Perl++ for DWIM!

[reply]
[d/l]

Re^2: "When closures capture their context" and "scope gotchas in Javascript"
by Jenda (Abbot) on Feb 08, 2008 at 23:25 UTC

You actually do not need to give the function a name:

(function(){alert('Gotcha')})();
[download]

function sayHello(name){
  var sayAlert;
  (function() {
     var text = 'Hello' + name;
     sayAlert = function() { alert(text) }
  })();
  var text = 'How confused am I?';
  sayAlert();
}
[download]

Jenda
Support Denmark!
Defend the free world!

[reply]
[d/l]
[select]