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From: Rolf Niepraschk <Rolf.Niepraschk@gmx.de>
Newsgroups: comp.lang.javascript
Subject: Iterating through an array (special syntax)
Date: Tue, 17 Oct 2017 12:39:12 +0200
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Hello,

I search for a function with the following characteristics:
--------------------------
function foo(arr) {
/* unknown implementation */
}

Call:

foo([1,2,3,4])
.each(function(oldItem, newItem) {
   console.log('old: ' + oldItem + '   ' + 'new: ' + newItem);
   // should be:
   // old: 1   new: 2
   // old: 2   new: 4
   // old: 3   new: 6
   // old: 4   new: 8
})
.done(function(result) {
   console.log('Result: ' + result);// should be: [2,4,6,8]
}
--------------------------
The names "each" and "done" are not important. The static array is an 
example. In reality the array is the result of a network request inside 
of the function.

What would be the best implementation? Thanks in advance.

...Rolf