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...
New to javascript and I'm having trouble counting the number of trues in an array of boolean values.  I'm trying to use the reduce() function.  Can someone tell me what I'm doing wrong?     //trying to count the number of true in an array...
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 have an array of objects, let's say [{x:2, y:3}, {x:5, y:4}] and i call reduce((c, n) => c.y + n.y); on it. It obviouslly returns 7.  However, if the array contains a single object, let's say [{x:2, y:4}] the same reduce call will return...
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...
var atLeast = function (tab,n,k){     var frequencyK = tab.reduce(function (acc, val, array){         if (val == k){             return acc+1;         }     });     return frequencyK >= n; }; console.log(atLeast([1,2,3,2,2,4,2,2],4,2));   This fun...
var ?= '110001'.split("").reverse(); var sum = 0; for (var i = 0; i < y.length; i++) {   sum += (y[i] * Math.pow(2, i)); } console.log(sum);...

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