How can I prevent this infinite loop, if I don’t know content of function

Question

How can I isolate my variable from variable in this function, if his creator forgot for var keyword?

for (var i = 0; i < 4; i++) 
{
    test();
}

function test() 
{
    i = 0;
}

Run your code in strict mode, so you'll get an error in modern browsers when creating implicit variables. Otherwise, scope your code to a new variable scope. — , Jun 30 '13 at 12:21
Javascript global/local variables http://stackoverflow.com/questions/4862193/javascript-global-variables — Alban, Jun 30 '13 at 18:37

Sami · Answer 1 · 2013-07-05T10:38:17.073

3

put your for loop in a separated scope:

in a function.

function test(){
  i = 0;
}
function trial(){
  for (var i = 0; i < 4; i++){
    test();
  }
}
trial();

That way only the code and functions inside the trial function can access variables declared at that level.

edited Jul 05 '13 at 10:38

answered Jun 30 '13 at 12:25

Sami

A. Wolff · Accepted Answer · 2013-06-30T16:16:39.190

3

Same idea than previous answer using scoping but a better way would be to use IIFE:

(function () {
    for (var i = 0; i < 4; i++) {
        test();
    }
})();

edited Jun 30 '13 at 16:16

answered Jun 30 '13 at 12:44

A. Wolff

1

I believe you mean IIFE. IIEF is, erm, something else. – Alan Jun 30 '13 at 16:09
1

@Alan ... ermmm... Would that make it more of a `disfunction` than a `function`? – Paul Jun 30 '13 at 18:45

2 Answers2