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From: Rolf Niepraschk <Rolf.Niepraschk@gmx.de>
Newsgroups: comp.lang.javascript
Subject: Re: Iterating through an array (special syntax)
Date: Thu, 19 Oct 2017 15:15:15 +0200
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Xref: csiph.com comp.lang.javascript:34132

Now I have found a solution by myself (old fashion syntax):

//=====================================================
function foo() {
   var fn_done, fn_each;
   var ctx = {
     done:function(fn) {fn_done = fn; return this;},
     each:function(fn) {fn_each = fn; return this;}
   }
   setTimeout(function() {
     var oldItems = [1,2,3,4],
       newItems = oldItems.map(function(x) {return x * 2});
     if (typeof fn_each == 'function') {
       for (var i=0; i<oldItems.length; i++) {
         fn_each(oldItems[i], newItems[i]);
       }
     }
     if (typeof fn_done == 'function') fn_done(newItems);
   }, 500);
   return ctx;
}

console.log('------------------------------');
foo()
.each(function(oldItem, newItem) {
   console.log('oldItem: ' + oldItem + '    ' + 'newItem: ' + newItem);
})
.done(function(result) {
   console.log('------------------------------');
   console.log('result: ' + result);
   console.log('------------------------------');
});
//=====================================================

I am sure this can be more elegant but it seems to work.

...Rolf