From d8194c0886a8ca08b279475f60cb9b8d8e8afd90 Mon Sep 17 00:00:00 2001
From: John-David Dalton <john.david.dalton@gmail.com>
Date: Fri, 22 Nov 2013 09:16:18 -0800
Subject: [PATCH] Allow `_.sortBy` to accept an array for `callback`.

---
 dist/lodash.compat.js         | 69 ++++++++++++++++++++--------
 dist/lodash.compat.min.js     | 84 +++++++++++++++++------------------
 dist/lodash.js                | 69 ++++++++++++++++++++--------
 dist/lodash.min.js            | 16 +++----
 dist/lodash.underscore.js     | 57 ++++++++++++++++--------
 dist/lodash.underscore.min.js |  6 +--
 lodash.js                     | 67 ++++++++++++++++++++--------
 test/saucelabs.js             |  4 +-
 test/test.js                  | 12 +++++
 9 files changed, 255 insertions(+), 129 deletions(-)

diff --git a/dist/lodash.compat.js b/dist/lodash.compat.js
index 5bd7e874a..3ee9a1697 100644
--- a/dist/lodash.compat.js
+++ b/dist/lodash.compat.js
@@ -281,22 +281,29 @@
    */
   function compareAscending(a, b) {
     var ac = a.criteria,
-        bc = b.criteria;
+        bc = b.criteria,
+        index = -1,
+        length = ac.length;
 
-    // ensure a stable sort in V8 and other engines
-    // http://code.google.com/p/v8/issues/detail?id=90
-    if (ac !== bc) {
-      if (ac > bc || typeof ac == 'undefined') {
-        return 1;
-      }
-      if (ac < bc || typeof bc == 'undefined') {
-        return -1;
+    while (++index < length) {
+      var value = ac[index],
+          other = bc[index];
+
+      if (value !== other) {
+        if (value > other || typeof value == 'undefined') {
+          return 1;
+        }
+        if (value < other || typeof other == 'undefined') {
+          return -1;
+        }
       }
     }
-    // The JS engine embedded in Adobe applications like InDesign has a buggy
-    // `Array#sort` implementation that causes it, under certain circumstances,
-    // to return the same value for `a` and `b`.
-    // See https://github.com/jashkenas/underscore/pull/1247
+    // Fixes an `Array#sort` bug in the JS engine embedded in Adobe applications
+    // that causes it, under certain circumstances, to return the same value for
+    // `a` and `b`. See https://github.com/jashkenas/underscore/pull/1247
+    //
+    // This also ensures a stable sort in V8 and other engines.
+    // See http://code.google.com/p/v8/issues/detail?id=90
     return a.index - b.index;
   }
 
@@ -4301,6 +4308,9 @@
      * If a property name is provided for `callback` the created "_.pluck" style
      * callback will return the property value of the given element.
      *
+     * If an array of property names is provided for `callback` the collection
+     * will be sorted by each property value.
+     *
      * If an object is provided for `callback` the created "_.where" style callback
      * will return `true` for elements that have the properties of the given object,
      * else `false`.
@@ -4309,7 +4319,7 @@
      * @memberOf _
      * @category Collections
      * @param {Array|Object|string} collection The collection to iterate over.
-     * @param {Function|Object|string} [callback=identity] The function called
+     * @param {Array|Function|Object|string} [callback=identity] The function called
      *  per iteration. If a property name or object is provided it will be used
      *  to create a "_.pluck" or "_.where" style callback, respectively.
      * @param {*} [thisArg] The `this` binding of `callback`.
@@ -4322,19 +4332,37 @@
      * _.sortBy([1, 2, 3], function(num) { return this.sin(num); }, Math);
      * // => [3, 1, 2]
      *
+     * var characters = [
+     *   { 'name': 'barney',  'age': 36 },
+     *   { 'name': 'fred',    'age': 40 },
+     *   { 'name': 'barney',  'age': 26 },
+     *   { 'name': 'fred',    'age': 30 }
+     * ];
+     *
      * // using "_.pluck" callback shorthand
-     * _.sortBy(['banana', 'strawberry', 'apple'], 'length');
-     * // => ['apple', 'banana', 'strawberry']
+     * _.map(_.sortBy(characters, 'age'), _.values);
+     * // => [['barney', 26], ['fred', 30], ['barney', 36], ['fred', 40]]
+     *
+     * // sorting by multiple properties
+     * _.map(_.sortBy(characters, ['name', 'age']), _.values);
+     * // = > [['barney', 26], ['barney', 36], ['fred', 30], ['fred', 40]]
      */
     function sortBy(collection, callback, thisArg) {
       var index = -1,
+          isArr = isArray(callback),
           length = collection ? collection.length : 0,
           result = Array(typeof length == 'number' ? length : 0);
 
-      callback = lodash.createCallback(callback, thisArg, 3);
+      if (!isArr) {
+        callback = lodash.createCallback(callback, thisArg, 3);
+      }
       forEach(collection, function(value, key, collection) {
         var object = result[++index] = getObject();
-        object.criteria = callback(value, key, collection);
+        if (isArr) {
+          object.criteria = map(callback, function(key) { return value[key]; });
+        } else {
+          (object.criteria = getArray())[0] = callback(value, key, collection);
+        }
         object.index = index;
         object.value = value;
       });
@@ -4344,6 +4372,9 @@
       while (length--) {
         var object = result[length];
         result[length] = object.value;
+        if (!isArr) {
+          releaseArray(object.criteria);
+        }
         releaseObject(object);
       }
       return result;
@@ -6196,7 +6227,7 @@
      * _.capitalize('fred');
      * // => 'Fred'
      *
-     * _('fred').capitalize();
+     * _('fred').capitalize().value();
      * // => 'Fred'
      */
     function mixin(object, source) {
diff --git a/dist/lodash.compat.min.js b/dist/lodash.compat.min.js
index 03576cdc2..3eff6feef 100644
--- a/dist/lodash.compat.min.js
+++ b/dist/lodash.compat.min.js
@@ -4,57 +4,57 @@
  * Build: `lodash -o ./dist/lodash.compat.js`
  */
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diff --git a/dist/lodash.js b/dist/lodash.js
index af48867e3..17ece3301 100644
--- a/dist/lodash.js
+++ b/dist/lodash.js
@@ -256,22 +256,29 @@
    */
   function compareAscending(a, b) {
     var ac = a.criteria,
-        bc = b.criteria;
+        bc = b.criteria,
+        index = -1,
+        length = ac.length;
 
-    // ensure a stable sort in V8 and other engines
-    // http://code.google.com/p/v8/issues/detail?id=90
-    if (ac !== bc) {
-      if (ac > bc || typeof ac == 'undefined') {
-        return 1;
-      }
-      if (ac < bc || typeof bc == 'undefined') {
-        return -1;
+    while (++index < length) {
+      var value = ac[index],
+          other = bc[index];
+
+      if (value !== other) {
+        if (value > other || typeof value == 'undefined') {
+          return 1;
+        }
+        if (value < other || typeof other == 'undefined') {
+          return -1;
+        }
       }
     }
-    // The JS engine embedded in Adobe applications like InDesign has a buggy
-    // `Array#sort` implementation that causes it, under certain circumstances,
-    // to return the same value for `a` and `b`.
-    // See https://github.com/jashkenas/underscore/pull/1247
+    // Fixes an `Array#sort` bug in the JS engine embedded in Adobe applications
+    // that causes it, under certain circumstances, to return the same value for
+    // `a` and `b`. See https://github.com/jashkenas/underscore/pull/1247
+    //
+    // This also ensures a stable sort in V8 and other engines.
+    // See http://code.google.com/p/v8/issues/detail?id=90
     return a.index - b.index;
   }
 
@@ -3953,6 +3960,9 @@
      * If a property name is provided for `callback` the created "_.pluck" style
      * callback will return the property value of the given element.
      *
+     * If an array of property names is provided for `callback` the collection
+     * will be sorted by each property value.
+     *
      * If an object is provided for `callback` the created "_.where" style callback
      * will return `true` for elements that have the properties of the given object,
      * else `false`.
@@ -3961,7 +3971,7 @@
      * @memberOf _
      * @category Collections
      * @param {Array|Object|string} collection The collection to iterate over.
-     * @param {Function|Object|string} [callback=identity] The function called
+     * @param {Array|Function|Object|string} [callback=identity] The function called
      *  per iteration. If a property name or object is provided it will be used
      *  to create a "_.pluck" or "_.where" style callback, respectively.
      * @param {*} [thisArg] The `this` binding of `callback`.
@@ -3974,19 +3984,37 @@
      * _.sortBy([1, 2, 3], function(num) { return this.sin(num); }, Math);
      * // => [3, 1, 2]
      *
+     * var characters = [
+     *   { 'name': 'barney',  'age': 36 },
+     *   { 'name': 'fred',    'age': 40 },
+     *   { 'name': 'barney',  'age': 26 },
+     *   { 'name': 'fred',    'age': 30 }
+     * ];
+     *
      * // using "_.pluck" callback shorthand
-     * _.sortBy(['banana', 'strawberry', 'apple'], 'length');
-     * // => ['apple', 'banana', 'strawberry']
+     * _.map(_.sortBy(characters, 'age'), _.values);
+     * // => [['barney', 26], ['fred', 30], ['barney', 36], ['fred', 40]]
+     *
+     * // sorting by multiple properties
+     * _.map(_.sortBy(characters, ['name', 'age']), _.values);
+     * // = > [['barney', 26], ['barney', 36], ['fred', 30], ['fred', 40]]
      */
     function sortBy(collection, callback, thisArg) {
       var index = -1,
+          isArr = isArray(callback),
           length = collection ? collection.length : 0,
           result = Array(typeof length == 'number' ? length : 0);
 
-      callback = lodash.createCallback(callback, thisArg, 3);
+      if (!isArr) {
+        callback = lodash.createCallback(callback, thisArg, 3);
+      }
       forEach(collection, function(value, key, collection) {
         var object = result[++index] = getObject();
-        object.criteria = callback(value, key, collection);
+        if (isArr) {
+          object.criteria = map(callback, function(key) { return value[key]; });
+        } else {
+          (object.criteria = getArray())[0] = callback(value, key, collection);
+        }
         object.index = index;
         object.value = value;
       });
@@ -3996,6 +4024,9 @@
       while (length--) {
         var object = result[length];
         result[length] = object.value;
+        if (!isArr) {
+          releaseArray(object.criteria);
+        }
         releaseObject(object);
       }
       return result;
@@ -5846,7 +5877,7 @@
      * _.capitalize('fred');
      * // => 'Fred'
      *
-     * _('fred').capitalize();
+     * _('fred').capitalize().value();
      * // => 'Fred'
      */
     function mixin(object, source) {
diff --git a/dist/lodash.min.js b/dist/lodash.min.js
index 707c4e634..28eb0b7ff 100644
--- a/dist/lodash.min.js
+++ b/dist/lodash.min.js
@@ -4,11 +4,11 @@
  * Build: `lodash modern -o ./dist/lodash.js`
  */
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-}}function r(n){return n.charCodeAt(0)}function u(n,t){var e=n.m,r=t.m;if(e!==r){if(e>r||typeof e=="undefined")return 1;if(e<r||typeof r=="undefined")return-1}return n.n-t.n}function o(n){var t=-1,r=n.length,u=n[0],o=n[r/2|0],a=n[r-1];if(u&&typeof u=="object"&&o&&typeof o=="object"&&a&&typeof a=="object")return false;for(u=f(),u["false"]=u["null"]=u["true"]=u.undefined=false,o=f(),o.k=n,o.l=u,o.push=e;++t<r;)o.push(n[t]);return o}function a(n){return"\\"+U[n]}function i(){return h.pop()||[]}function f(){return g.pop()||{k:null,l:null,m:null,"false":false,n:0,"null":false,number:null,object:null,push:null,string:null,"true":false,undefined:false,o:null}
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diff --git a/dist/lodash.underscore.js b/dist/lodash.underscore.js
index b1a8f86b4..ce857b730 100644
--- a/dist/lodash.underscore.js
+++ b/dist/lodash.underscore.js
@@ -115,22 +115,29 @@
    */
   function compareAscending(a, b) {
     var ac = a.criteria,
-        bc = b.criteria;
+        bc = b.criteria,
+        index = -1,
+        length = ac.length;
 
-    // ensure a stable sort in V8 and other engines
-    // http://code.google.com/p/v8/issues/detail?id=90
-    if (ac !== bc) {
-      if (ac > bc || typeof ac == 'undefined') {
-        return 1;
-      }
-      if (ac < bc || typeof bc == 'undefined') {
-        return -1;
+    while (++index < length) {
+      var value = ac[index],
+          other = bc[index];
+
+      if (value !== other) {
+        if (value > other || typeof value == 'undefined') {
+          return 1;
+        }
+        if (value < other || typeof other == 'undefined') {
+          return -1;
+        }
       }
     }
-    // The JS engine embedded in Adobe applications like InDesign has a buggy
-    // `Array#sort` implementation that causes it, under certain circumstances,
-    // to return the same value for `a` and `b`.
-    // See https://github.com/jashkenas/underscore/pull/1247
+    // Fixes an `Array#sort` bug in the JS engine embedded in Adobe applications
+    // that causes it, under certain circumstances, to return the same value for
+    // `a` and `b`. See https://github.com/jashkenas/underscore/pull/1247
+    //
+    // This also ensures a stable sort in V8 and other engines.
+    // See http://code.google.com/p/v8/issues/detail?id=90
     return a.index - b.index;
   }
 
@@ -2734,6 +2741,9 @@
    * If a property name is provided for `callback` the created "_.pluck" style
    * callback will return the property value of the given element.
    *
+   * If an array of property names is provided for `callback` the collection
+   * will be sorted by each property value.
+   *
    * If an object is provided for `callback` the created "_.where" style callback
    * will return `true` for elements that have the properties of the given object,
    * else `false`.
@@ -2742,7 +2752,7 @@
    * @memberOf _
    * @category Collections
    * @param {Array|Object|string} collection The collection to iterate over.
-   * @param {Function|Object|string} [callback=identity] The function called
+   * @param {Array|Function|Object|string} [callback=identity] The function called
    *  per iteration. If a property name or object is provided it will be used
    *  to create a "_.pluck" or "_.where" style callback, respectively.
    * @param {*} [thisArg] The `this` binding of `callback`.
@@ -2755,9 +2765,20 @@
    * _.sortBy([1, 2, 3], function(num) { return this.sin(num); }, Math);
    * // => [3, 1, 2]
    *
+   * var characters = [
+   *   { 'name': 'barney',  'age': 36 },
+   *   { 'name': 'fred',    'age': 40 },
+   *   { 'name': 'barney',  'age': 26 },
+   *   { 'name': 'fred',    'age': 30 }
+   * ];
+   *
    * // using "_.pluck" callback shorthand
-   * _.sortBy(['banana', 'strawberry', 'apple'], 'length');
-   * // => ['apple', 'banana', 'strawberry']
+   * _.map(_.sortBy(characters, 'age'), _.values);
+   * // => [['barney', 26], ['fred', 30], ['barney', 36], ['fred', 40]]
+   *
+   * // sorting by multiple properties
+   * _.map(_.sortBy(characters, ['name', 'age']), _.values);
+   * // = > [['barney', 26], ['barney', 36], ['fred', 30], ['fred', 40]]
    */
   function sortBy(collection, callback, thisArg) {
     var index = -1,
@@ -2767,7 +2788,7 @@
     callback = createCallback(callback, thisArg, 3);
     forEach(collection, function(value, key, collection) {
       result[++index] = {
-        'criteria': callback(value, key, collection),
+        'criteria': [callback(value, key, collection)],
         'index': index,
         'value': value
       };
@@ -4233,7 +4254,7 @@
    * _.capitalize('fred');
    * // => 'Fred'
    *
-   * _('fred').capitalize();
+   * _('fred').capitalize().value();
    * // => 'Fred'
    */
   function mixin(object) {
diff --git a/dist/lodash.underscore.min.js b/dist/lodash.underscore.min.js
index e4a46655c..b239a89e1 100644
--- a/dist/lodash.underscore.min.js
+++ b/dist/lodash.underscore.min.js
@@ -3,7 +3,7 @@
  * Lo-Dash 2.3.0 (Custom Build) lodash.com/license | Underscore.js 1.5.2 underscorejs.org/LICENSE
  * Build: `lodash underscore exports="amd,commonjs,global,node" -o ./dist/lodash.underscore.js`
  */
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+;(function(){function n(n,r,t){t=(t||0)-1;for(var e=n?n.length:0;++t<e;)if(n[t]===r)return t;return-1}function r(n,r){for(var t=n.m,e=r.m,u=-1,o=t.length;++u<o;){var i=t[u],f=e[u];if(i!==f){if(i>f||typeof i=="undefined")return 1;if(i<f||typeof f=="undefined")return-1}}return n.n-r.n}function t(n){return"\\"+vr[n]}function e(n,r,t){r||(r=0),typeof t=="undefined"&&(t=n?n.length:0);var e=-1;t=t-r||0;for(var u=Array(0>t?0:t);++e<t;)u[e]=n[r+e];return u}function u(n){return n instanceof u?n:new o(n)}function o(n,r){this.__chain__=!!r,this.__wrapped__=n
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@@ -29,8 +29,8 @@ n[u]=v(n[u],1,null,null,n)}return n},u.chain=function(n){return n=new o(n),n.__c
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+})},u.rest=G,u.shuffle=z,u.sortBy=function(n,t,e){var u=-1,o=n?n.length:0,i=Array(typeof o=="number"?o:0);for(t=Q(t,e,3),q(n,function(n,r,e){i[++u]={m:[t(n,r,e)],n:u,o:n}}),o=i.length,i.sort(r);o--;)i[o]=i[o].o;return i},u.tap=function(n,r){return r(n),n},u.throttle=function(n,r,t){var e=true,u=true;if(!E(n))throw new TypeError;return false===t?e=false:A(t)&&(e="leading"in t?t.leading:e,u="trailing"in t?t.trailing:u),t={},t.leading=e,t.maxWait=r,t.trailing=u,L(n,r,t)},u.times=function(n,r,t){n=-1<(n=+n)?n:0;
+var e=-1,u=Array(n);for(r=a(r,t,1);++e<n;)u[e]=r(e);return u},u.toArray=function(n){return zr(n)?e(n):n&&typeof n.length=="number"?I(n):N(n)},u.union=function(){return g(p(arguments,true,true))},u.uniq=J,u.values=N,u.where=P,u.without=function(n){return c(n,e(arguments,1))},u.wrap=function(n,r){return v(r,16,[n])},u.zip=function(){for(var n=-1,r=M(Yr(arguments,"length")),t=Array(0>r?0:r);++n<r;)t[n]=Yr(arguments,n);return t},u.collect=I,u.drop=G,u.each=q,u.extend=b,u.methods=j,u.object=function(n,r){var t=-1,e=n?n.length:0,u={};
 for(r||!e||zr(n[0])||(r=[]);++t<e;){var o=n[t];r?u[o]=r[t]:o&&(u[o[0]]=o[1])}return u},u.select=B,u.tail=G,u.unique=J,u.clone=function(n){return A(n)?zr(n)?e(n):b({},n):n},u.contains=R,u.escape=function(n){return null==n?"":(n+"").replace(Hr,y)},u.every=k,u.find=F,u.has=function(n,r){return n?Sr.call(n,r):false},u.identity=X,u.indexOf=V,u.isArguments=d,u.isArray=zr,u.isBoolean=function(n){return true===n||false===n||n&&typeof n=="object"&&Tr.call(n)==ar||false},u.isDate=function(n){return n&&typeof n=="object"&&Tr.call(n)==lr||false
 },u.isElement=function(n){return n&&1===n.nodeType||false},u.isEmpty=T,u.isEqual=function(n,r){return s(n,r)},u.isFinite=function(n){return Fr(n)&&!qr(parseFloat(n))},u.isFunction=E,u.isNaN=function(n){return O(n)&&n!=+n},u.isNull=function(n){return null===n},u.isNumber=O,u.isObject=A,u.isRegExp=function(n){return n&&hr[typeof n]&&Tr.call(n)==sr||false},u.isString=S,u.isUndefined=function(n){return typeof n=="undefined"},u.lastIndexOf=function(n,r,t){var e=n?n.length:0;for(typeof t=="number"&&(e=(0>t?Ir(0,e+t):Mr(t,e-1))+1);e--;)if(n[e]===r)return e;
 return-1},u.mixin=Y,u.noConflict=function(){return yr._=xr,this},u.random=function(n,r){return null==n&&null==r&&(r=1),n=+n||0,null==r?(r=n,n=0):r=+r||0,n+Or($r()*(r-n+1))},u.reduce=$,u.reduceRight=W,u.result=function(n,r){if(n){var t=n[r];return E(t)?n[r]():t}},u.size=function(n){var r=n?n.length:0;return typeof r=="number"?r:Pr(n).length},u.some=C,u.sortedIndex=H,u.template=function(n,r,e){var o=u,i=o.templateSettings;n=(n||"")+"",e=w({},e,i);var f=0,a="__p+='",i=e.variable;n.replace(RegExp((e.escape||ur).source+"|"+(e.interpolate||ur).source+"|"+(e.evaluate||ur).source+"|$","g"),function(r,e,u,o,i){return a+=n.slice(f,i).replace(or,t),e&&(a+="'+_.escape("+e+")+'"),o&&(a+="';"+o+";\n__p+='"),u&&(a+="'+((__t=("+u+"))==null?'':__t)+'"),f=i+r.length,r
diff --git a/lodash.js b/lodash.js
index 87663c8df..e37003790 100644
--- a/lodash.js
+++ b/lodash.js
@@ -280,22 +280,29 @@
    */
   function compareAscending(a, b) {
     var ac = a.criteria,
-        bc = b.criteria;
+        bc = b.criteria,
+        index = -1,
+        length = ac.length;
 
-    // ensure a stable sort in V8 and other engines
-    // http://code.google.com/p/v8/issues/detail?id=90
-    if (ac !== bc) {
-      if (ac > bc || typeof ac == 'undefined') {
-        return 1;
-      }
-      if (ac < bc || typeof bc == 'undefined') {
-        return -1;
+    while (++index < length) {
+      var value = ac[index],
+          other = bc[index];
+
+      if (value !== other) {
+        if (value > other || typeof value == 'undefined') {
+          return 1;
+        }
+        if (value < other || typeof other == 'undefined') {
+          return -1;
+        }
       }
     }
-    // The JS engine embedded in Adobe applications like InDesign has a buggy
-    // `Array#sort` implementation that causes it, under certain circumstances,
-    // to return the same value for `a` and `b`.
-    // See https://github.com/jashkenas/underscore/pull/1247
+    // Fixes an `Array#sort` bug in the JS engine embedded in Adobe applications
+    // that causes it, under certain circumstances, to return the same value for
+    // `a` and `b`. See https://github.com/jashkenas/underscore/pull/1247
+    //
+    // This also ensures a stable sort in V8 and other engines.
+    // See http://code.google.com/p/v8/issues/detail?id=90
     return a.index - b.index;
   }
 
@@ -4319,6 +4326,9 @@
      * If a property name is provided for `callback` the created "_.pluck" style
      * callback will return the property value of the given element.
      *
+     * If an array of property names is provided for `callback` the collection
+     * will be sorted by each property value.
+     *
      * If an object is provided for `callback` the created "_.where" style callback
      * will return `true` for elements that have the properties of the given object,
      * else `false`.
@@ -4327,7 +4337,7 @@
      * @memberOf _
      * @category Collections
      * @param {Array|Object|string} collection The collection to iterate over.
-     * @param {Function|Object|string} [callback=identity] The function called
+     * @param {Array|Function|Object|string} [callback=identity] The function called
      *  per iteration. If a property name or object is provided it will be used
      *  to create a "_.pluck" or "_.where" style callback, respectively.
      * @param {*} [thisArg] The `this` binding of `callback`.
@@ -4340,19 +4350,37 @@
      * _.sortBy([1, 2, 3], function(num) { return this.sin(num); }, Math);
      * // => [3, 1, 2]
      *
+     * var characters = [
+     *   { 'name': 'barney',  'age': 36 },
+     *   { 'name': 'fred',    'age': 40 },
+     *   { 'name': 'barney',  'age': 26 },
+     *   { 'name': 'fred',    'age': 30 }
+     * ];
+     *
      * // using "_.pluck" callback shorthand
-     * _.sortBy(['banana', 'strawberry', 'apple'], 'length');
-     * // => ['apple', 'banana', 'strawberry']
+     * _.map(_.sortBy(characters, 'age'), _.values);
+     * // => [['barney', 26], ['fred', 30], ['barney', 36], ['fred', 40]]
+     *
+     * // sorting by multiple properties
+     * _.map(_.sortBy(characters, ['name', 'age']), _.values);
+     * // = > [['barney', 26], ['barney', 36], ['fred', 30], ['fred', 40]]
      */
     function sortBy(collection, callback, thisArg) {
       var index = -1,
+          isArr = isArray(callback),
           length = collection ? collection.length : 0,
           result = Array(typeof length == 'number' ? length : 0);
 
-      callback = lodash.createCallback(callback, thisArg, 3);
+      if (!isArr) {
+        callback = lodash.createCallback(callback, thisArg, 3);
+      }
       forEach(collection, function(value, key, collection) {
         var object = result[++index] = getObject();
-        object.criteria = callback(value, key, collection);
+        if (isArr) {
+          object.criteria = map(callback, function(key) { return value[key]; });
+        } else {
+          (object.criteria = getArray())[0] = callback(value, key, collection);
+        }
         object.index = index;
         object.value = value;
       });
@@ -4362,6 +4390,9 @@
       while (length--) {
         var object = result[length];
         result[length] = object.value;
+        if (!isArr) {
+          releaseArray(object.criteria);
+        }
         releaseObject(object);
       }
       return result;
diff --git a/test/saucelabs.js b/test/saucelabs.js
index 9d3a6cc22..e32e0034b 100644
--- a/test/saucelabs.js
+++ b/test/saucelabs.js
@@ -74,8 +74,8 @@
     ['Windows 7', 'internet explorer', '8'],
     ['Windows XP', 'internet explorer', '7'],
     ['Windows XP', 'internet explorer', '6'],
-    ['Windows 7', 'opera', '12'],
-    ['Windows 7', 'opera', '11'],
+    //['Windows 7', 'opera', '12'],
+    //['Windows 7', 'opera', '11'],
     ['OS X 10.8', 'safari', '6'],
     ['Windows 7', 'safari', '5'],
     ['Windows XP', 'safari', '4']
diff --git a/test/test.js b/test/test.js
index 4be6f09b8..97d005d56 100644
--- a/test/test.js
+++ b/test/test.js
@@ -6512,6 +6512,18 @@
       deepEqual(actual, [3, 1, 2]);
     });
 
+    test('should work with an array for `callback`', 1, function() {
+      var objects = [
+        { 'a': 'x', 'b': 3 },
+        { 'a': 'y', 'b': 4 },
+        { 'a': 'x', 'b': 1 },
+        { 'a': 'y', 'b': 2 }
+      ];
+
+      var actual = _.sortBy(objects, ['a', 'b']);
+      deepEqual(actual, [objects[2], objects[0], objects[3], objects[1]]);
+    });
+
     test('should work with a string for `callback`', 1, function() {
       var actual = _.pluck(_.sortBy(objects, 'num'), 'num');
       deepEqual(actual, [0, 11, 16, 74, 212, 991, 1515]);