From a06207b81416f907c79bf0d0ade5d926e8a86bcb Mon Sep 17 00:00:00 2001
From: Filip Zawada <me@filimanjaro.com>
Date: Fri, 14 Nov 2014 02:28:53 +0100
Subject: [PATCH] Add lazy _.pluck and _.where. [closes #776]

---
 lodash.js    | 10 ++++++++++
 test/test.js | 30 ++++++++++++++++++++++++++++++
 2 files changed, 40 insertions(+)

diff --git a/lodash.js b/lodash.js
index ff009c477..f010fc5e9 100644
--- a/lodash.js
+++ b/lodash.js
@@ -10190,6 +10190,16 @@
       };
     });
 
+    // add `LazyWrapper` methods for `_.pluck` and `_.where`
+    arrayEach(['pluck', 'where'], function (methodName, index) {
+      var operationName = index ? 'filter' : 'map',
+          getCallback = index ? matches : property;
+
+      LazyWrapper.prototype[methodName] = function (arg) {
+        return this[operationName](getCallback(arg));
+      };
+    });
+
     LazyWrapper.prototype.dropWhile = function(iteratee, thisArg) {
       iteratee = getCallback(iteratee, thisArg, 3);
 
diff --git a/test/test.js b/test/test.js
index 07c4cc0c4..9445462b2 100644
--- a/test/test.js
+++ b/test/test.js
@@ -9262,6 +9262,19 @@
       deepEqual(_.pluck(objects, 'a'), [1, undefined, undefined, 4]);
     });
 
+    test('should work in a lazy chain sequence', 1, function () {
+      if (!isNpm) {
+        var array = [{prop: 1}, null, {prop: 3}, {prop: 4}];
+
+        var wrapped = _(array).filter(Boolean).pluck("prop");
+
+        deepEqual(wrapped.value(), [1, 3, 4]);
+      }
+      else {
+        skipTest();
+      }
+    });
+
     test('should coerce `key` to a string', 1, function() {
       function fn() {}
       fn.toString = _.constant('fn');
@@ -12473,6 +12486,23 @@
 
       deepEqual(actual, expected);
     });
+
+    test('should work in a lazy chain sequence', 1, function () {
+      if (!isNpm) {
+        var array = [
+          {'a': 1},
+          {'a': 3},
+          {'a': 1, 'b': 2}
+        ];
+
+        var wrapped = _(array).where({'a': 1});
+
+        deepEqual(wrapped.value(), [array[0], array[2]]);
+      }
+      else {
+        skipTest();
+      }
+    });
   }());
 
   /*--------------------------------------------------------------------------*/