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From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Newsgroups: comp.lang.javascript
Subject: Re: Iterating through an array (special syntax)
Date: Wed, 18 Oct 2017 13:55:09 +0200
Organization: PointedEars Software (PES)
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Rolf Niepraschk wrote:

> […] How must be the function modified if the array
> is generated in an asynchronous way? For example:
> 
> //--------------------------------------------------------
> function foo() {
>    setTimeout(function() {
>      var arr = [1,2,3,4];
>      // ???
>    }, 500);
> }
> 
> foo().each((oldItem,newItem) => {
>     console.log(`oldItem: ${oldItem} newItem: ${newItem}`)
> })
> //--------------------------------------------------------

  function foo (callback)
  {
    var t = window.setTimeout(function () {
      window.clearTimeout(t);
      var arr = [1, 2, 3, 4];
      callback(arr);
    }, 500);
  }

  foo((a) => {
    // a.forEach(…);
  });

But AISB, your approach at problem solving is *unwise* at best.

For example, window.setTimeout() is a host object’s method provided by Web 
browsers; it is unavailable in nodeJS, while there are other, *better* ways
to do this in nodeJS, *depending on the specific task*.

[en] <https://en.wikipedia.org/wiki/Problem_solving>
[de] <https://de.wikipedia.org/wiki/Probleml%C3%B6sen>

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