From f28667dd367cb071650f158f544ec7c741ac9fcb Mon Sep 17 00:00:00 2001
From: Swizz <gerodel.quentin@gmail.com>
Date: Sat, 11 Nov 2017 14:35:03 +0100
Subject: [PATCH] Add array support to patch

---
 src/index.js        |  4 ++--
 tests/patch.test.js | 30 +++++++++++++++++++++++++++++-
 2 files changed, 31 insertions(+), 3 deletions(-)

diff --git a/src/index.js b/src/index.js
index 767e071..b1e1599 100644
--- a/src/index.js
+++ b/src/index.js
@@ -31,7 +31,7 @@ export function diff(from, to) {
   return patch
 }
 
-export function patch(from, diff) {
+export function patch(from, diff, array) {
   var to = {}
   for (var key in from) {
     to[key] = from[key]
@@ -39,5 +39,5 @@ export function patch(from, diff) {
   for (var key in diff) {
     to[key] = diff[key]
   }
-  return to
+  return array && "length" in to ? Array.from(to) : to
 }
\ No newline at end of file
diff --git a/tests/patch.test.js b/tests/patch.test.js
index 890c9f6..1c3f21c 100644
--- a/tests/patch.test.js
+++ b/tests/patch.test.js
@@ -111,6 +111,10 @@ describe("array", () => {
     expect(Array.from(patch(from, future.do))).toEqual(to)
 
     expect(Array.from(patch(to, future.undo))).toEqual(from)
+
+    expect(patch(from, future.do, true)).toEqual(to)
+
+    expect(patch(to, future.undo, true)).toEqual(from)
   })
 
   test("patch deleted", () => {
@@ -123,6 +127,10 @@ describe("array", () => {
     expect(Array.from(patch(from, future.do))).toEqual(to)
 
     expect(Array.from(patch(to, future.undo))).toEqual(from)
+
+    expect(patch(from, future.do, true)).toEqual(to)
+
+    expect(patch(to, future.undo, true)).toEqual(from)
   })
 
   test("patch updated", () => {
@@ -135,6 +143,10 @@ describe("array", () => {
     expect(Array.from(patch(from, future.do))).toEqual(to)
 
     expect(Array.from(patch(to, future.undo))).toEqual(from)
+
+    expect(patch(from, future.do, true)).toEqual(to)
+
+    expect(patch(to, future.undo, true)).toEqual(from)
   })
 
   test("patch kept", () => {
@@ -147,5 +159,21 @@ describe("array", () => {
     expect(Array.from(patch(from, future.do))).toEqual(to)
 
     expect(Array.from(patch(to, future.undo))).toEqual(from)
+
+    expect(patch(from, future.do, true)).toEqual(to)
+
+    expect(patch(to, future.undo, true)).toEqual(from)
   })
-})
+
+  test("do not transform object", () => {
+    const from = { a: 1, b: 1 }
+
+    const to = { a: 1, b: 2, c: 3 }
+
+    const future = diff(from, to)
+
+    expect(patch(from, future.do, true)).toEqual(to)
+
+    expect(patch(to, future.undo, true)).toEqual(from)
+  })
+})
\ No newline at end of file