javascript create dictionary from array

Issue

I have an array like this

propertiesToCheck: [
    {name: 'name', type: 'type', enabled: true},
    {
        name: 'name2',
        type: 'type2',
        templateUrl: 'something.html',
        preferences: {
            places: [place1, place2,...],
            placesDict: ????
        },
        enabled: true
    }
]

In the places array there are objects with id, name, etc. Now I want to create a dictionary placesDict that should look like {place1.id: 0, place2.id: 0, ...}, so all values will be set to 0. How can I do that?

Solution

var placesDict = {};
propertiesToCheck[1].preferences.places.forEach(place => {
  placesDict[place.id] = 0;
});

Same thing but using function definition instead of arrow function.

var placesDict = {};
propertiesToCheck[1].preferences.places.forEach(setPlace);

function setPlace (place) {
  placesDict[place.id] = 0; 
}

---

To have this functionality attached to a method of the preferences object:

propertiesToCheck: [
    {name: 'name', type: 'type', enabled: true},
    {
        name: 'name2',
        type: 'type2',
        templateUrl: 'something.html',
        preferences: {
            places: [place1, place2,...],
            placesDict: () => {
              newDict = {}; 
              propertiesToCheck[1].preferences.places.forEach(place => newDict[place.id] = 0);
              return newDict;
            }
        },
        enabled: true
    }
]

console.log(propertiesToCheck[1].preferences.placesDict()); // {place1.id: 0, place2.id: 0, ...}

Setting the property placesDict to be equal to a function return value:

propertiesToCheck: [
    {name: 'name', type: 'type', enabled: true},
    {
        name: 'name2',
        type: 'type2',
        templateUrl: 'something.html',
        preferences: {
            places: [place1, place2,...],
            placesDict: createDict()
        },
        enabled: true
    }
]

function createDict() {
  var placesDict = {};
  propertiesToCheck[1].preferences.places.forEach(place => {
    placesDict[place.id] = 0; 
  }); 
}

I hope this helped.

Answered By - jakeehoffmann