How to map list of objects to dictionary or map?

Question

I am trying to create a childDict for later usage. I'm not just trying actually, I am succeeding.

This works:

const childDict = new Map(
  this.voteCards.toArray().map(card => {
    return [card.placeInfo.id, card.placeInfo];
  })
);

However, the interpreter is not happy. I'll spare you the error message which is just a type conflict.

So how can I map a list to a dictionary or map?

Answer 1

Here is a way to convert array of Objects to a dictionary in one line:

var voteCardsArray = [
    { placeInfo: { id: 42, desc: 'stuff 42' } },
    { placeInfo: { id: 65, desc: 'stuff 65' } },
    { placeInfo: { id: 89, desc: 'stuff 89' } },
];

var res = Object.assign({}, ...voteCardsArray.map(card => ({[card.placeInfo.id]: card.placeInfo})));

console.log(res)