I am trying to binding dynamic checkboxes on FormArray, when I reproduce  on stackblitz its work, but show me error on my IDE, and I am using Array.prototype.map not the rxjs map and I got error in console.log:     core.js:9110 ERROR TypeError: this....
There is an array of objects   const data = [{     "name": "08/20/2018",     "id": "name_1" }, {     "name": "12/23/2018",     "id": "name_2" }]   and I would like to map this array of o...
const jumbledNums = [123, 7, 25, 78, 5, 9];   const lessThanTen = jumbledNums.findIndex(num => {   return num < 10; });   Hi, my problem is that this snippet is returning only first met index of element meeting condition num < 10 , but I wan...
In this moment i have a problem. How can i push a lot of data for work with it outside of .map().   I need push a lot of data in const todo = [] and see data outside of .map() codigoP.map  i tried with .promise but i don't know how implement when...
I have a nodejs express application with an api to return data from a mongodb database. This is my mongoose model:  const bookingSchema = new mongoose.Schema({   timestamp: {     type: Date,     default: Date.now,     required: true   },   tags: {...
New to javascript and trying to learn! I am trying to map through two array of objects, and if a certain property matches, pull in specific information into the first array.   let result;  let arrNames = [{   id: 10     name: "A" }, {   id: 1...
Am trying to arrive at the answer below in a different way.  Using let {items} = user to destructure instead of user.items.   But using let {items} = user doesn't return the original array changed (adding "!" to the items).   const array...
**UPDATE**  /* This is my file in Node: */  var Crawler = require("crawler"); const fs = require('fs');  function iterObj(obj) { let arr = [] let objValues = Object.values(obj); // use var to avoid additonal heap overhead of new var...
New to javascript and I'm struggling with a simple map method.   I'd like to iterate over two arrays of objects, and set state to include the result of each mapping. Currently, state is being overwritten with each new item.  Desired output:...
How to map items without undefined value in javascript with Array.prototype.map and without Array.prototype.filter()  Code:  var testArray = [   {     name: "toto",     totoNumber: "1",   },   {     name: "tata",     totoNumbe...

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