feat(arrays): Reverse

Add reverse function for arrays.

re #4

Author: danielrbradley

src/arrays.ts

@@ -259,6 +259,10 @@ export function sortByDescending<T, Key>(a: any, b?: any): any {
   return partial ? exec : exec(a)
 }
 
+export function reverse<T>(source: T[]): T[] {
+  return Array.from(source).reverse()
+}
+
 export function sumBy<T>(selector: (item: T) => number): (source: T[]) => number
 export function sumBy<T>(source: T[], selector: (item: T) => number): number
 export function sumBy<T>(a: any, b?: any): any {

test/arrays.test.ts

@@ -291,6 +291,16 @@ describe('sortByDescending', () => {
     ).toEqual([{ name: 'amy', age: 21 }, { name: 'cat', age: 18 }, { name: 'bob', age: 2 }])
   })
 })
+
+describe('reverse', () => {
+  test('empty', () => {
+    expect(Arrays.reverse([])).toEqual([])
+  })
+  test('reversal', () => {
+    expect(Arrays.reverse([8, 3, 5])).toEqual([5, 3, 8])
+  })
+})
+
 describe('sumBy', () => {
   test('piping', () => {
     expect(