const arr=[11,2222,33333,444444,55555,666666]

const obj1 = Object.assign({}, arr);

document.write(obj1)

output:-

{ '0': 11,
  '1': 2222,
  '2': 33333,
  '3': 444444,
  '4': 55555,
  '5': 666666 }

//Hi i want to assign same key to my all the value which method i should be using there.