How can I get a unique array based on object property using underscore

Question

I have an array of objects and I want to get a new array from it that is unique based only on a single property, is there a simple way to achieve this?

Eg.

Answer 1

unique array by id property with ES6:

arr.filter((a, i) => arr.findIndex(b => b.id === a.id) === i);  // unique by id

replace b.id === a.id with the relevant comparison for your case