convert set to object

Question

I have a set which needs to be converted into an object with the set\'s unique values as the object keys and an empty string as each element\'s value in the object.

H

Answer 1

You can use Array.from with a mapping function to convert each value inside your set into an object and then use Object.assign() with the spread syntax to merge the array of objects into a single resulting object like so:

const uom = new Set(['inches', 'centimeters', 'yards', 'meters']);
const res = Object.assign(...Array.from(uom, v => ({[v]:''})));
console.log(res);

Answer 2

Create an object, then loop over the values in the set and create a property for each one. The reduce method is probably the most compact way to do that.

const uom = new Set(['inches', 'centimeters', 'yards', 'meters']);
const result = Array.from(uom).reduce( (a,c) => { a[c]=""; return a; }, {});
console.log(result);

Answer 3

Here's one way:

[...uom].reduce((o, u) => {
  o[u] = '';
  return o;
}, {})

Answer 4

You can use Array.prototype.reduce to get the elements from the set and accumulate it in an object:

const uom = new Set(['inches', 'centimeters', 'yards', 'meters']);
const getObjectFromSet = (set) => {
return [...set].reduce((r, k) => {r[k] = ""; return r; },{});
}
console.log(getObjectFromSet(uom));

You can also use the Object.fromEntries for ES6+ code:

const uom = new Set(['inches', 'centimeters', 'yards', 'meters']);
const getObjectFromSet = (set) => {
  return Object.fromEntries(Array.from(set, (k) => [k, ""]));
}
console.log(getObjectFromSet(uom));