Dedupe Array of Objects

example.js

var items = [
  {
    someProp: '0',
    otherProp: 'a'
  },
  {
    someProp: '1',
    otherProp: 'c'
  },
  {
    someProp: '2',
    otherProp: 'b'
  },
  {
    someProp: '1',
    otherProp: 'c'
  },
  {
    someProp: '3',
    otherProp: 'd'
  }
];

var deduped = items.reduce(function(accumulator, item) {
  accumulator[item.someProp] = item;
  return accumulator;
}, {});

console.log(deduped);