Transform an array of objets to an object by selected key

arrray_to_object.js

// Input array
const peopleArray = [
  { id: 123, name: "dave", age: 23 },
  { id: 456, name: "chris", age: 23 },
  { id: 789, name: "bob", age: 23 },
  { id: 101, name: "tom", age: 23 },
  { id: 102, name: "tim", age: 23 }
]

// Simple function
const arrayToObject = (array, keyField) => array.reduce((total, current) => {
  total[current[keyField]] = current;
  return total;
}, {});

// Call
console.log(arrayToObject(peopleArray, "name"))

// Inline
peopleArray.reduce((total, current) => {
  total[current["name"]] = current;
  return total;
}, {});


// Transform objetc key function
const arrayToObjectTransform = (array, keyField, transform) => array.reduce((total, current) => {
  total[transform(current[keyField])] = current;
  return total;
}, {});

// Call
const upper = (value) => value.toUpperCase();
console.log(arrayToObjectTransform(peopleArray, "name", upper));
console.log(arrayToObjectTransform(peopleArray, "name", (v) => v.toUpperCase()));

// Inline
peopleArray.reduce((total, current) => {
  total[upper(current["name"])] = current;
  return total;
}, {});