fancy-dedupe

Usage

npm install fancy-dedupe --save

const dedupe = require("fancy-dedupe");

API

dedupe.one(items, [createKey])

Use dedupe.one to dedupe a single array of items. For an array of primitives, all you need is the first parameter:

dedupe.one([1, 1, 2]);
// => [1, 2]

You may also supply a custom comparison function, createKey. It should return a primitive value.

function getId(item) {
  return item.id;
}

dedupe.one([{id: 1}, {id: 1}, {id: 2}], getId);
// => [{id: 1}, {id: 2}]

dedupe.group(group, [createKey])

Use dedupe.group to dedupe multiple arrays of items. Earlier arrays in the group take preference. Like dedupe.one, you may supply a createKey function. Each array will also be individually deduped.

dedupe.group([
  [1, 1, 2],
  [2, 3, 4]
]);
// => [[1, 2], [3, 4]]

function getId(item) {
  return item.id;
}
dedupe.group([
  [{id: 1}, {id: 1}, {id: 2}],
  [{id: 2}, {id: 3}, {id: 4}]
]);
// => [[{id: 1}, {id: 2}], [{id: 3}, {id: 4}]]