Invoke function in javascript

Question

Possible Duplicate:
What do parentheses surrounding a JavaScript object/function/class declaration mean?

Why following code does not work

function func() {
    document.writeln("HELLO");
}();

UPDATE:
Why in following example O should not use parentesis around "function{}"?

var v = function() {
   return "HELLO";
}();

document.writeln(v);

score 4 · Accepted Answer · answered Jun 20 '12 at 13:12

4

Use either this:

function func() {
    document.writeln("HELLO");
}

func();

Or this:

(function() {
    document.writeln("HELLO");
})();

answered Jun 20 '12 at 13:12

VisioN

1

Your answers are as good as your profile pic – Jun 20 '12 at 13:14
1

+1 AMAZING! DUDE YOU'RE THE JS MASTER! `:)` – gdoron Jun 20 '12 at 13:18
Why should I use parenthesis in the second example? See update in my question. – Volodymyr Bezuglyy Jun 20 '12 at 13:46
@VladimirBezugliy Because in your update `v` gets value of `"HELLO"`. `()` means immediate calling of the defined function. – VisioN Jun 20 '12 at 13:51

score 1 · Answer 2 · answered Jun 20 '12 at 13:14

1

try:

(function() {
  document.writeln('HELLO');
})();

answered Jun 20 '12 at 13:14

Sandeep Kumar

Why should I use parenthesis in the second example? See update in my question. – Volodymyr Bezuglyy Jun 20 '12 at 13:47

2 Answers2