I've an array of objects with the following format  [{'list': 'one', 'item': 1},   {'list': 'one', 'item': 2},  {'list': 'one', 'item': 3},  {'list': 'two', &...
The following code:  let myArray = Array.apply(null, {length: 10}).map(Number.call, Number);   Creates the following Array:  [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]   I just don't understand why.  I can't find anything on the internet that explains th...
I have [3, 16, 120]. when I do [3, 16, 120].map(mapper), I want to achieve, for example [4,5,  17,18,  121,122] i.e. each element map to n+1 and n+2. This is of course an example - what I want is to simply push multiple values from mapper function  D...
Looking at the map function in JavaScript, what am I doing wrong here?  // input: [{name: "Kevin"}, {name: "Bob"}]; // output: [{"Kevin" : 0}, {"Bob" : 1}]; var map = function(arr, property) {       var i = 0;...
What would be the equivalent of this without using a for loop?  Unsure what array method to use  function func(x){     var y = [];     for(i=0;i<x.length;i++){         y.push(x[i]);         y.push(x[i]);     }     return y; }  var input = [1,2,3,4...
I cannot load an image after calling map function:  this.rosImgs.push({img: '../imgs/ros_eat.png', id: this.imgId});  getRosette(){     return this.rosImgs.map((obj) =>       <TouchableHighlight key={obj.id} onPress={() => this.imgCl...
This is my Code. Where I want to Pass the Values of kvArray to Second Array.  var kvArray = [{key: 1, value: 10},                 {key: 2, value: 20},                 {key: 3, value: 30}];  var reformattedArray = kvArray.map(obj => {     var paylo...
I have an object that contains an array and a couple of other values that I need to pass to the backend, but the backend needs to receive it as an array of objects. I fill in an array ($scope.student) by using checkboxes and the other values (docenti...
In my function I have the following variable:  const updatedData = data.map(elements => {   return {...elements, information: {programs: elements.programs.map(program => {     return {...program, pids: program.pids.map(pid => {       return...
Using javascript functional programming methods (like map/reduce), how would one aggregate/count the status field of arr1 and transform it to an array of key/value objects in arr2.   arr1 = [   {'task':'do something 1', 'status...

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