I've been running into a couple of problems with javascript promises, particularly with stacked chains.   Can anyone explain to me the difference (if there is any!) between these different implementations?   IMPLEMENTATION 1  var serverSideProm...
Lets imagine function like this:  function foo(x) {     x += '+';     return x; }   Usage of it would be like:  var x, y; x = 'Notepad'; y = foo(x); console.log(y); // Prints 'Notepad+'.   I'm looking for a way to create...
I know it works, but I don't know why and how. What are the mechanics?  // Parent constructor function Parent(name){   this.name = name || "The name property is empty"; }  // Child constructor function Child(name){   this.name = name; }...
I think I have got my head around Parse promise chains, but what I don't understand is how I return my data from the functions (i) back up the promise chain and (ii) back to the calling method of my original JS code.  Using the code below, the fi...
Evolving from Javascript, spliced FileReader for large files with Promises, how?, which showed me how a Promise can also resolve a function, now I am stuck with the same but inside an Array.reduce function.  The goal is that I want to upload a file (...
for example...  if ( /* Condition */ ) {      if ( /* Condition */ ) {          if ( /* Condition */ ) {            // Superb!          } else {            // Error 3          }      } else {        // Error 2      }  } else {    // Error 1  }   Do y...
This is a question for the guru of JavaScript. I'm trying to do work with JavaScript prototype model more elegant. Here is my utility code (it provides real chain of prototypes and correct work with instanceof operator):  function Class(conf) {...
A simple function below:  const L = a => L;   forms   L L(1) L(1)(2) ...   This seems to form a list but the actual data is not stored at all, so if it's required to store the data such as [1,2], what is the smartest practice to have the task...
The question is at the title, but first please look at this code:  function number(a) {     return {         add: function(b) {             result = a + b;             return this;         }, substract(b) {             result = a - b;             ret...
I'm trying to use FileReader to read several files sequentially using promises for that. The problem is that I need to divide the reading operations in several chunks to make them doable. By doing so, I lose the Promise chain. This is what happen...

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