How can I break the iteration on reduce method?  for  for (var i = Things.length - 1; i >= 0; i--) {   if(Things[i] <= 0){     break;   } };   reduce  Things.reduce(function(memo, current){   if(current <= 0){     //break ???     //return;...
Is there any way to map/reduce/filter/etc a Set in JavaScript or will I have to write my own?  Here's some sensible Set.prototype extensions  Set.prototype.map = function map(f) {   var newSet = new Set();   for (var v of this.values()) newSet.ad...
In ES5, the new array method reduce(). I am wondering if someone can explain more in depth.     var test = [1, 2, 3, 4, 5].reduce(function(inital, item, idx) {   return inital + item }, 0);  console.log(test);     In this example, we know for a fact...
For education purposes, I was trying to re-create Underscore.js's _.reduce() method. While I was able to do this in an explicit style using for loops. But this is far from ideal because it mutates the original list that was supplied as an argumen...
I am needing to build a custom object from an array of objects in Typescript.  In the giving example below, How do I count how many times the salesman_1_name is in  the Array, Add the gross for each Salesman_1_name, and count if warranty is not null...
Assuming an array of objects as follows:  const listOfTags = [     {id: 1, label: "Hello", color: "red", sorting: 0},     {id: 2, label: "World", color: "green", sorting: 1},     {id: 3, label: "Hello", color:...
How do I retain the accumulative value of my reduce function? Each iteration resets the object value.    const a = [1, 2, 3, 4, 5];  const b = {   1: {     name: 'Dan',     age: 25   },   2: {     name: 'Peter',     age: 28   },   3:...
What the best practice to filter or reduce an object? I would have done this via for-loop and created a new array but understand that you can do it somehow via filter property in JavaScript?  var myObject = [   {dimensions: [451, 255], margins: [0, 2...
I recently started using Ramda and trying to find a pointfree way to write a method to reduce an array of objects.  Here is the array of object :  const someObj = [     {         name: 'A',         city: 1,         other: {             playti...
I have a simple factorial function:   function factorial(n){   let array = Array(n).fill(0).map((e, i) => i + 1)   if (array.length) return array.reduce((a, b) => a * b);   else {     return 1;   } }     But for some reason, this is throwing Ex...

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