What is the 'iterator' function in Firebug?

Question

In Firebug, when looking at a getElementsByTagName array, which is of type HTMLCollection I see the following functions listed:

I know how to use item(number of item) and namedItem(name of item). But what is the use of iterator() ?

I couldn't find an answer, so I'm asking here.

ZER0 · Accepted Answer · 2013-04-08 20:21:45Z

2

It's the method JavaScript calls when you iterate over an object using a for…of loop, for instance.

An example:

var myobj = {
  iterator: function() {
    for (let i = 0; i < 5; i++)
      yield i;
  }
}

for (let value of myobj)
  console.log(value);

See also yield.

In case of an HTMLCollection it helps you to write code like:

let divs = document.getElementsByTagName("div");

for (let div of divs) {
  // do something with `div`
}

answered Apr 8, 2013 at 20:21

ZER0

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