maybe you could try by mapping your array and returning new array of object like this

const array1 = [1, 2, 3, 4];
const newArr = array1.map(i => {return {uri: i}})

console.log(newArr);
// > Array [Object { uri: 1 }, Object { uri: 2 }, Object { uri: 3 }, Object { uri: 4 }]

If you need in the form of (Array of objects)

var test = ['a', 'b', 'c', 'd'];

function setID(item, index) {
  var fullname = {"id: ": item};
  return fullname;
}

var output = test.map(setID);
console.log(output);

output: [ { "id: ": "a" }, { "id: ": "b" }, { "id: ": "c" }, { "id: ": "d" } ]

Use Array.from! It's really simple and faster.

var test = ['a', 'b', 'c', 'd'];
var newTest = Array.from(test, val => 'id: '+ val);
console.log(newTest);

output: [ "id: a", "id: b", "id: c", "id: d" ]