es6-unique-by-property-array.js

const array = [{id:1}, {id:2}, {id:3}, {id:4}, {id:5}, {id:2}, {id:6}, {id:4}, {id:7}];

function unique(array, propertyName) {
  return array.filter((e, i) => array.findIndex(a => a[propertyName] === e[propertyName]) === i);
}

console.log(unique(array, 'id'))
/*
output: 
[{"id":1},{"id":2},{"id":3},{"id":4},{"id":5},{"id":6},{"id":7}]
*/
// perf: https://jsperf.com/compare-unique-array-by-property