convert a serial array to an object in JavaScript and TypeScript

objectify.js

function objectify(arr) {
  return Object.fromEntries(arr.reduce((acc, cur, idx) => (idx%2 ? acc[acc.length-1].push(cur) : acc.push([cur])) && acc, []));
}

objectify.ts

interface LooseObject {
  [key: string]: string;
}

export function objectify(array: Array<string>): LooseObject {
  const result: LooseObject = {};
  const length = array.length;

  for (let i = 1; i < length; i += 2) {
    result[array[i-1]] = array[i];
  }

  return result;
}