From 7c16ef942e135ea64a69ce8025c75c140c113d83 Mon Sep 17 00:00:00 2001
From: Thomas Shafer <tshafer@google.com>
Date: Wed, 26 Oct 2016 16:14:34 -0700
Subject: [PATCH] feat(core): add the find method to QueryList

---
 modules/@angular/core/src/linker/query_list.ts       |  6 ++++++
 modules/@angular/core/test/linker/query_list_spec.ts | 10 ++++++++++
 tools/public_api_guard/core/index.d.ts               |  1 +
 3 files changed, 17 insertions(+)

diff --git a/modules/@angular/core/src/linker/query_list.ts b/modules/@angular/core/src/linker/query_list.ts
index 8657ff9ac8..708ceffac1 100644
--- a/modules/@angular/core/src/linker/query_list.ts
+++ b/modules/@angular/core/src/linker/query_list.ts
@@ -57,6 +57,12 @@ export class QueryList<T>/* implements Iterable<T> */ {
     return this._results.filter(fn);
   }
 
+  /**
+   * See
+   * [Array.find](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/find)
+   */
+  find(fn: (item: T, index: number, array: T[]) => boolean): T { return this._results.find(fn); }
+
   /**
    * See
    * [Array.reduce](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/reduce)
diff --git a/modules/@angular/core/test/linker/query_list_spec.ts b/modules/@angular/core/test/linker/query_list_spec.ts
index 5e88356c35..03f7b90805 100644
--- a/modules/@angular/core/test/linker/query_list_spec.ts
+++ b/modules/@angular/core/test/linker/query_list_spec.ts
@@ -70,6 +70,16 @@ export function main() {
       expect(queryList.filter((x: string, i: number) => i == 0)).toEqual(['one']);
     });
 
+    it('should support find', () => {
+      queryList.reset(['one', 'two']);
+      expect(queryList.find((x: string) => x == 'two')).toEqual('two');
+    });
+
+    it('should support find with index', () => {
+      queryList.reset(['one', 'two']);
+      expect(queryList.find((x: string, i: number) => i == 1)).toEqual('two');
+    });
+
     it('should support reduce', () => {
       queryList.reset(['one', 'two']);
       expect(queryList.reduce((a: string, x: string) => a + x, 'start:')).toEqual('start:onetwo');
diff --git a/tools/public_api_guard/core/index.d.ts b/tools/public_api_guard/core/index.d.ts
index c06424959d..ba0609543f 100644
--- a/tools/public_api_guard/core/index.d.ts
+++ b/tools/public_api_guard/core/index.d.ts
@@ -697,6 +697,7 @@ export declare class QueryList<T> {
     last: T;
     length: number;
     filter(fn: (item: T, index: number, array: T[]) => boolean): T[];
+    find(fn: (item: T, index: number, array: T[]) => boolean): T;
     forEach(fn: (item: T, index: number, array: T[]) => void): void;
     map<U>(fn: (item: T, index: number, array: T[]) => U): U[];
     notifyOnChanges(): void;