Do I need to delete local variables used in a callback in JavaScript?

Question

Admittedly this stems from my lack of deep understanding of closures. I found myself with a memory leak and am wondering if this bit of code has anything to do with it. There does not seem to be a destructor I can manually call in the documentation for these typed arrays:

  myMethod: function() {
    // Create a new array on the heap
    var someData = new Uint8Array(32);
    someData[0] = 1;
    someData[1] = 2;
    ...

    transferSomeData(someData.buffer, function(succeeded) {
      // Dispose of the array
      someData = []; // HOW TO DELETE?
    });
  }

Barmar · Accepted Answer · 2015-02-06 01:20:23Z

1

No, you don't need to delete them. When the callback function exits, the values will become garbage because they aren't accessible, and the garbage collector will recover them.

answered Feb 6, 2015 at 1:20

Barmar

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