✨ union

Author: tangweikun

src/array/__tests__/union.spec.js

@@ -0,0 +1,13 @@
+import { union } from '..'
+
+test('union', () => {
+ expect(union([], [])).toEqual([])
+})
+
+test('union', () => {
+ expect(union([2, 1, 2], [2, 3], [4])).toEqual([2, 1, 3, 4])
+})
+
+test('union', () => {
+ expect(union([1, 2], [2, 2], [1])).toEqual([1, 2])
+})

src/array/index.js

@@ -29,3 +29,4 @@ export * from './pullAt'
 export * from './remove'
 export * from './take'
 export * from './takeRight'
+export * from './union'

src/array/union.js

@@ -0,0 +1,2 @@
+export const union = (...arr) =>
+ Array.from(new Set(arr.reduce((acc, x) => [...acc, ...x], [])))