From 07cbfdb424a52d713884c5fa4ce1b343aa1c8e22 Mon Sep 17 00:00:00 2001
From: John-David Dalton <john.david.dalton@gmail.com>
Date: Sat, 10 Nov 2012 23:09:23 -0800
Subject: [PATCH] Optimize `_.contains`.

Former-commit-id: b50628adedd21fe2c099f4dcab1aa9f0036a22ed
---
 build.js                 | 18 +++++++++-----
 lodash.js                | 15 +++++++----
 lodash.min.js            | 54 ++++++++++++++++++++--------------------
 lodash.underscore.min.js | 48 +++++++++++++++++------------------
 test/test-build.js       |  1 +
 5 files changed, 74 insertions(+), 62 deletions(-)

diff --git a/build.js b/build.js
index 54361519d..f402d37d0 100755
--- a/build.js
+++ b/build.js
@@ -70,7 +70,7 @@
     'clone': ['extend', 'forEach', 'forOwn', 'isArguments', 'isObject', 'isPlainObject'],
     'compact': [],
     'compose': [],
-    'contains': ['indexOf', 'isString', 'some'],
+    'contains': ['forEach', 'indexOf', 'isString'],
     'countBy': ['forEach'],
     'debounce': [],
     'defaults': ['isArguments'],
@@ -974,7 +974,7 @@
         dependencyMap.reduceRight = ['forEach', 'keys'];
       }
       if (isUnderscore) {
-        dependencyMap.contains = ['indexOf', 'some'],
+        dependencyMap.contains = ['forEach', 'indexOf'],
         dependencyMap.isEqual = ['isArray', 'isFunction'];
         dependencyMap.isEmpty = ['isArray', 'isString'];
         dependencyMap.max = ['forEach', 'isArray'];
@@ -1075,10 +1075,16 @@
         // replace `_.contains`
         source = source.replace(/^( *)function contains[\s\S]+?\n\1}/m, [
           '  function contains(collection, target) {',
-          '    var length = collection ? collection.length : 0;',
-          "    return typeof length == 'number'",
-          '      ? indexOf(collection, target) > -1',
-          '      : some(collection, function(value) { return value === target; });',
+          '    var length = collection ? collection.length : 0,',
+          '        result = false;',
+          "    if (typeof length == 'number') {",
+          '      result = indexOf(collection, target) > -1;',
+          '    } else {',
+          '      forEach(collection, function(value) {',
+          '        return (result = value === target) && indicatorObject;',
+          '      });',
+          '    }',
+          '    return result;',
           '  }'
         ].join('\n'));
 
diff --git a/lodash.js b/lodash.js
index 6d302da0e..c8fa41289 100644
--- a/lodash.js
+++ b/lodash.js
@@ -1836,18 +1836,23 @@
    */
   function contains(collection, target, fromIndex) {
     var index = -1,
-        length = collection ? collection.length : 0;
+        length = collection ? collection.length : 0,
+        result = false;
 
     fromIndex = (fromIndex < 0 ? nativeMax(0, length + fromIndex) : fromIndex) || 0;
     if (typeof length == 'number') {
-      return (isString(collection)
+      result = (isString(collection)
         ? collection.indexOf(target, fromIndex)
         : indexOf(collection, target, fromIndex)
       ) > -1;
+    } else {
+      forEach(collection, function(value) {
+        if (++index >= fromIndex) {
+          return !(result = value === target);
+        }
+      });
     }
-    return some(collection, function(value) {
-      return ++index >= fromIndex && value === target;
-    });
+    return result;
   }
 
   /**
diff --git a/lodash.min.js b/lodash.min.js
index 6e1a529f5..fac7f1919 100644
--- a/lodash.min.js
+++ b/lodash.min.js
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diff --git a/test/test-build.js b/test/test-build.js
index bbcbbbb7a..84fbf9d68 100644
--- a/test/test-build.js
+++ b/test/test-build.js
@@ -644,6 +644,7 @@
         equal(object.fn(), 2, '_.bind: ' + basename);
 
         ok(lodash.clone(array, true)[0] === array[0], '_.clone should be shallow: ' + basename);
+        equal(lodash.contains({ 'a': 1, 'b': 2 }, 1), true, '_.contains should work with objects: ' + basename);
         equal(lodash.contains([1, 2, 3], 1, 2), true, '_.contains should ignore `fromIndex`: ' + basename);
         equal(lodash.every([true, false, true]), false, '_.every: ' + basename);