The program is to sort objects based upon the array object with key age.

ageSorter.js

var arr=[{name:"sidd",age:26},{name:"john",age:30},{name:"gary",age:20}];

function compare(a,b) {
  if (a.age < b.age)
    return -1;
  if (a.age > b.age)
    return 1;
  return 0;
}

arr.sort(compare);
alert(JSON.stringify(arr));