Ryuichi Okumura

Faster function that happen async with YUI

January 31, 2013

From next version of YUI, timers module will add into YUI core module. You can use Y.soon function by this module.

This function is similar to Y.later, used when there is something that you want to process asynchronously. Recently, we have come out that can be used to implement a function called setImmediate in IE10 and Node.js 0.9. Y.soon can also consider such implementation, asynchronous processing is performed faster than Y.later.

Just show you an example.

<script src="http://yui.yahooapis.com/3.9.0pr2/build/yui/yui-min.js"></script>
<script>
YUI().use('timers', function (Y) {
  Y.log('hello timers');
  var asyncTask = Y.soon(myTask);
  Y.log('end timers');
  function myTask() {
    Y.log('called myTask()');
  }
});
</script>

It results in the following.

hello timers
end timers
called myTask()

YUI also supports Node.js, so that the same logic also works on the browser, even on Node.js.

In addition, there is a function called to cancel in object that Y.soon returns. You can then call this function to cancel the action to be performed.

<script src="http://yui.yahooapis.com/3.9.0pr2/build/yui/yui-min.js"></script>
<script>
YUI().use('timers', function (Y) {
  Y.log('hello timers');
  var asyncTask = Y.soon(myTask);
  Y.log('end timers');
  asyncTask.cancel();
  function myTask() {
    Y.log('called myTask()');
  }
});
</script>

If you call cancel and you will not be executed.

hello timers
end timers

This feature is available from YUI 3.9.0, its Preview Release 2 is currently. The GA is planned in the near future. There is a possibility that Y.later is obsolete in the future, it would be good to remember that the Y.soon.