Create object from array

Question

Simply

 const obj = {};

 for (const key of yourArray) {
      obj[key] = whatever;
 }

or if you prefer "functional" style:

 const obj = yourArray.reduce((o, key) => Object.assign(o, {[key]: whatever}), {});

using the modern object spread operator:

const obj = yourArray.reduce((o, key) => ({ ...o, [key]: whatever}), {})

Example:

[
  { id: 10, color: "red" },
  { id: 20, color: "blue" },
  { id: 30, color: "green" }
].reduce((acc, cur) => ({ ...acc, [cur.color]: cur.id }), {})

Output:

{red: 10, blue: 20, green: 30}

Here is how it works:

reduce is initialized with an empty object (empty {} at the end), therefore first iteration variables are acc = {} cur = { id: 10, color: "red" }. Function returns an object - this is why function body is wrapped in parentheses => ({ ... }). Spread operator doesn't do anything on the first iteration, so red: 10 is set as first item.

On the second iteration variables are acc = { red: 10 } cur = { id: 20, color: "blue" }. Here the spread operator expands acc and the function returns { red: 10, blue: 20 }.

Third iteration acc = { red: 10, blue: 20 } cur = { id: 30, color: "green" }, so when acc is spread inside the object, our function returns the final value.

The new Object.fromEntries, from ECMAScript 2019, makes it even easier to transform values from an array into keys in an object like follows

const dynamicArray = ["2007", "2008", "2009", "2010"];
const obj = Object.fromEntries(
  dynamicArray.map(year => [year, {
    something: "based",
    on: year
  }])
)

console.log(obj)

in js with es6 reduce function for array I do it like this

let x = [1,2,3]
let y = x.reduce((acc, elem) => {
  acc[elem] = elem // or what ever object you want inside
  return acc
}, {})
console.log(y) // {1:1, 2:2, 3:3}

var keys = ['key1', 'key2', 'key3']

var object = Object.assign({}, ...Object.entries({...keys}).map(([a,b]) => ({ [b]: 'someValue' })))
console.log(object)

This will produce

{ key1: 'someValue', key2: 'someValue', key3: 'someValue' }