I've an array of objects with the following format  [{'list': 'one', 'item': 1},   {'list': 'one', 'item': 2},  {'list': 'one', 'item': 3},  {'list': 'two', &...

I'm trying to use an array.some function to iterate through some data and return my field if the if statement succeeds.  What I am finding is happening instead, is that I am getting a boolean return e.g true instead of the actual variable (which...

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...

This is going to be a bit lengthy, but I'm looking for help as to how to tackle/think through this. I want to get into the habit of thinking critically with this problem, but I've hit a wall. So any tricks/tips/advice are appreciated.  So I h...

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 have been desperately trying to make a call to the "Feature" model before moving to (if(serviceExists===undefined)) line as shown below but to no avail. I thought async await was the way to go but it doesn't help either.  I have tried p...

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...

I have a command handler that uses a map with commands assigned from user command folders and a general comm folder. User can add their own commands. the map filters using name inside the file which is also how the call them. How do I make a comparis...