Add values from Object in Array Object in Javascript

Question

I need a solution to add some values from an Object (weekdayMap) into an existing array (vehicleAvailabilities) with objects in it. On day one i need the value Montag on day 2 the value Dienstag

and so on

I need the result like this:

const result = [ {id: 1, day: "1", value: true, weekday: 'Montag'}, {id: 2, day: "2", value: true, weekday: 'Dienstag'} ... 

from this both:

const vehicleAvailabilities = [ {id: 1, day: "1", value: true}, {id: 2, day: "2", value: true}, {id: 3, day: "3", value: true}, {id: 4, day: "4", value: true}, {id: 5, day: "5", value: true}, {id: 6, day: "6", value: false}, {id: 7, day: "7", value: false} ] const weekdayMap = { 1: 'Montag', 2: 'Dienstag', 3: 'Mittwoch', 4: 'Donnerstag', 5: 'Freitag', 6: 'Samstag', 7: 'Sonntag' } 

Answer 1

ES6 solution.

const a = [{id:1,day:"1",value:true},{id:2,day:"2",value:true},{id:3,day:"3",value:true},{id:4,day:"4",value:true},{id:5,day:"5",value:true},{id:6,day:"6",value:false},{id:7,day:"7",value:false}]; const b = {1:'Montag',2:'Dienstag',3:'Mittwoch',4:'Donnerstag',5:'Freitag',6:'Samstag',7:'Sonntag'}; const r = Object.keys(b).map((v, i) => ({ weekday: b[v], ...a[i] })); console.log(r);

Answer 2

here is a demo, i love array map and all new functional code in js

const vehicleAvailabilities = [ {id: 1, day: "1", value: true}, {id: 2, day: "2", value: true}, {id: 3, day: "3", value: true}, {id: 4, day: "4", value: true}, {id: 5, day: "5", value: true}, {id: 6, day: "6", value: false}, {id: 7, day: "7", value: false} ] const weekdayMap = { 1: 'Montag', 2: 'Dienstag', 3: 'Mittwoch', 4: 'Donnerstag', 5: 'Freitag', 6: 'Samstag', 7: 'Sonntag' } let re = vehicleAvailabilities.map(function(item){ item.weekday = weekdayMap[item.day]; return item; }) console.log(re); 

Answer 3

Make your own function for it:

const vehicleAvailabilities = [ {id: 1, day: "1", value: true}, {id: 2, day: "2", value: true}, {id: 3, day: "3", value: true}, {id: 4, day: "4", value: true}, {id: 5, day: "5", value: true}, {id: 6, day: "6", value: false}, {id: 7, day: "7", value: false} ] const weekdayMap = { 1: 'Montag', 2: 'Dienstag', 3: 'Mittwoch', 4: 'Donnerstag', 5: 'Freitag', 6: 'Samstag', 7: 'Sonntag' } function mergeMapIntoArray(map, array) { return array.map((entry) => { entry.weekday = map[entry.id]; return entry; }); } console.log(mergeMapIntoArray(weekdayMap, vehicleAvailabilities));

Answer 4

Here an example script that using the map and simply add a new property to the objects.

var vehicleAvailabilities = [ {id: 1, day: "1", value: true}, {id: 2, day: "2", value: true}, {id: 3, day: "3", value: true}, {id: 4, day: "4", value: true}, {id: 5, day: "5", value: true}, {id: 6, day: "6", value: false}, {id: 7, day: "7", value: false} ]; const weekdayMap = { 1: 'Montag', 2: 'Dienstag', 3: 'Mittwoch', 4: 'Donnerstag', 5: 'Freitag', 6: 'Samstag', 7: 'Sonntag' } var result = []; var item; for(var i=0;i<vehicleAvailabilities.length;i++){ item = vehicleAvailabilities[i]; item.weekday = weekdayMap[parseInt(item.day)]; result.push(item); } console.log(result);

Answer 5

If you are on typescript or ES6 you can make the suggestion from @Álvaro Touzón even easier:

let re = vehicleAvailabilities.map(item => item.weekday = weekdayMap[item.day])