Is there a way to only show selected property in a json object based on a array

Question

I have the following object

calendarLists = [
    {Title: titel1, Color:blue, number:1}
    {Title: titel2, Color:green, number:2}]
    {Title: titel3, Color         


        

Answer 1

You could map the wanted properties as objects, collect them to a single object and mapp all objects for a new array.

var calendarLists = [
  { Title: 'titel1', Color: 'blue', number: 1 }, 
  { Title: 'titel2', Color: 'green', number: 2 }, 
  { Title: 'titel3', Color: 'red', number: 3 }
],
keys = ['Title', 'number'],
result = calendarLists.map(o => Object.assign(...keys.map(k => ({ [k]: o[k] }))));

console.log(result);

The same with a destructuring assignment and short hand properties.

var calendarLists = [
  { Title: 'titel1', Color: 'blue', number: 1 }, 
  { Title: 'titel2', Color: 'green', number: 2 }, 
  { Title: 'titel3', Color: 'red', number: 3 }
],
   result = calendarLists.map(({ Title, number }) => ({ Title, number }));

console.log(result);

Answer 2

Your calendarLists has syntax error. You can map this array and filter wanted properties.

calendarLists = [{
    Title: 'titel1',
    Color: 'blue',
    number: 1
  },
  {
    Title: 'titel2',
    Color: 'green',
    number: 2
  },
  {
    Title: 'titel3',
    Color: 'red',
    number: 3
  }
];

result = calendarLists.map(
  calendarList => {
    return {
      Title: calendarList.Title,
      number: calendarList.number
    }
  }
);

console.log(result);