How well is the `for of` JavaScript statement supported?

This is the ES6 for..of loop. According to the MDN article i just linked, it's supported by several browsers (see there for exact versions), but not IE. Currently, several mobile browsers also support it.

The classic way of doing this is as follows:

  for(var i = 0; i < nameArray.length; i++){
    var str = nameArray[i];
  }

This will give you the exact functionality of a "foreach" loop, which I suspect is what you're really after here. This also gives you the added benefit of working in Internet Explorer.

There is also extensive knowledge of the exact loop described in the MDN. At this time Android web and it seems not everything supports your method so check the compatibility list on that page; seems to be a future release of the new JavaScript that will probably have OOP inside it.

MDN:

While for...in iterates over property names, for...of iterates over property values.

The above is what for...of loop does. The below is its current status.

This is an experimental technology, part of the Harmony (ECMAScript 6) proposal. Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future version of browsers as the spec changes.