Arc Forum | > With "var bar = function() { ... };", I bet you run into self-recursion is...

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1 point by evanrmurphy 5089 days ago | link | parent

> With "var bar = function() { ... };", I bet you run into self-recursion issues. Unless I'm mistaken, the variable "bar" isn't in the scope of the closure. At the very least, (def bar ...) and (def foo ...) won't be corecursive, since foo isn't in bar's scope.

Actually, both of these cases are working fine for me with the ``var bar = function() {...};`` format. This is testing in Chrome 5 on Linux:

  // recursion

  var foo = function(x) { 
    if (x == 0) 
      return "done"; 
    else 
      return foo(x - 1); 
  };

  foo(5)
  // => "done" 

  // corecursion

  var foo = function(x) { 
    if (x == 0) 
      return "done"; 
    else 
      return bar(x - 1); 
  };

  var bar = function(x) { 
    if (x == 0) 
      return "done"; 
    else 
      return foo(x - 1); 
  };

  foo(5)
  // => "done"
  bar(5)
  // => "done"

Am I missing something here?

1 point by rocketnia 5089 days ago | link

Actually, you're right. ^^; In JavaScript, all variables declared in a function are visible throughout the function, even before the declaration statement.

  var foo = 4;
  
  (function(){
    alert( foo );  // "undefined"
    var foo = 2;
  })();

My mistake. ^_^;

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