JAVASCRIPT

js create object from array

[
  { 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}

js create object from array

 const obj = {};

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

create object from array

// create object from array
const createObjectFromArray = (arr) => {
  let obj = {};
  for (let value of arr) {
    obj[value] = ++obj[value] || 1;
  }
  return obj;
};