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Javascript closures?

Started by Epp Jan 12, 2006 at 9:35 AM 2 replies 500+ views

Original Post

Jan 12, 2006 at 9:35 AM

Is the function returned by the repeater function from this post really a closure?


function repeater(n) {
  return function(w) {
    for (var r = '', i = [0]; i < n; i++) {
      r += w;
    }
    return r;
  }
}

Because it can still access and modify the global variable scope which Wikipedia states closures can't. But Wikipedia also states that javascript supports closures, so how do you write them?

ToohrVyk

238

ToohrVyk

Jan 12, 2006 at 9:45 AM

Use the same syntax, but don't access or modify global variables.

As a side note, if a closure contains a mutable object (for instance, a global mutable object), it can modify that object.

Epp

Author

Epp

Jan 12, 2006 at 11:23 AM

Yes but can you still call it a closure if you just don't access or modify global variables. If so any normal function which doesn't access or modify global variables would be a closure.

kSquared

192

kSquared

Jan 12, 2006 at 11:46 AM

Quote:
Original post by Epp
Yes but can you still call it a closure if you just don't access or modify global variables.

Yes, you can. A construct is a closure if it satisfies certain properties. Merely because these properties are not enforced by the compiler doesn't change the fact that it's still a closure.

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