diff --git a/AppKit/CPColorPanel.j b/AppKit/CPColorPanel.j
index d00baa311..c30c07cab 100644
--- a/AppKit/CPColorPanel.j
+++ b/AppKit/CPColorPanel.j
@@ -483,13 +483,12 @@ var CPColorPanelSwatchesCookie = "CPColorPanelSwatchesCookie";
         ];
     }
 
-    var cookieValue = eval(cookieValue),
-        result = [];
+    var cookieValue = eval(cookieValue);
 
-    for (var i = 0; i < cookieValue.length; i++)
-        result.push([CPColor colorWithHexString:cookieValue[i]]);
-
-    return result;
+    return [cookieValue arrayByApplyingBlock:function(value, _)
+    {
+        return [CPColor colorWithHexString:value];
+    }];
 }
 
 - (CPArray)saveColorList
diff --git a/AppKit/CPGradient.j b/AppKit/CPGradient.j
index dfa7a3437..126e43995 100644
--- a/AppKit/CPGradient.j
+++ b/AppKit/CPGradient.j
@@ -70,11 +70,12 @@ CPGradientDrawsAfterEndingLocation      = kCGGradientDrawsAfterEndLocation;
 {
     if (self = [super init])
     {
-        var cgColors = [],
-            count = [someColors count],
-            colorSpace = [aColorSpace CGColorSpace] || CGColorSpaceCreateDeviceRGB;
-        for (var i = 0; i < count; i++)
-            cgColors.push(CGColorCreate(colorSpace, [someColors[i] components]));
+        var colorSpace = [aColorSpace CGColorSpace] || CGColorSpaceCreateDeviceRGB,
+            cgColors = [someColors arrayByApplyingBlock:function(color, _)
+            {
+                return CGColorCreate(colorSpace, [color components])
+            }];
+
         _gradient = CGGradientCreateWithColors(colorSpace, cgColors, someLocations);
     }
 
diff --git a/AppKit/CPGraphics.j b/AppKit/CPGraphics.j
index 380bea393..207e05c8c 100644
--- a/AppKit/CPGraphics.j
+++ b/AppKit/CPGraphics.j
@@ -43,10 +43,10 @@ function CPDrawTiledRects(
     if (sides.length != grays.length)
         [CPException raise:CPInvalidArgumentException reason:@"sides (length: " + sides.length + ") and grays (length: " + grays.length + ") must have the same length."];
 
-    var colors = [];
-
-    for (var i = 0; i < grays.length; ++i)
-        colors.push([CPColor colorWithCalibratedWhite:grays[i] alpha:1.0]);
+    var colors = [grays arrayByApplyingBlock:function(gray, _)
+    {
+        return [CPColor colorWithCalibratedWhite:gray alpha:1.0];
+    }];
 
     return CPDrawColorTiledRects(boundsRect, clipRect, sides, colors);
 }
diff --git a/AppKit/CPPopUpButton.j b/AppKit/CPPopUpButton.j
index 09aecb6fe..77c6cda06 100644
--- a/AppKit/CPPopUpButton.j
+++ b/AppKit/CPPopUpButton.j
@@ -361,15 +361,10 @@ CPPopUpButtonStatePullsDown = CPThemeState("pulls-down");
 */
 - (CPArray)itemTitles
 {
-    var titles = [],
-        items = [self itemArray],
-        index = 0,
-        count = [items count];
-
-    for (; index < count; ++index)
-        titles.push([items[index] title]);
-
-    return titles;
+    return [[self itemArray] arrayByApplyingBlock:function(item, _)
+    {
+        return [item title];
+    }];
 }
 
 /*!
diff --git a/AppKit/CPThemeBlend.j b/AppKit/CPThemeBlend.j
index 8455bd4c0..a34544841 100644
--- a/AppKit/CPThemeBlend.j
+++ b/AppKit/CPThemeBlend.j
@@ -64,12 +64,10 @@
 */
 - (CPArray)themeNames
 {
-    var names = [];
-
-    for (var i = 0; i < _themes.length; ++i)
-        names.push(_themes[i].substring(0, _themes[i].indexOf(".keyedtheme")));
-
-    return names;
+    return [_themes arrayByApplyingBlock:function(theme, _)
+    {
+        return theme.substring(0, theme.indexOf(".keyedtheme"));
+    }];
 }
 
 - (void)loadWithDelegate:(id)aDelegate
diff --git a/AppKit/CPToolbar.j b/AppKit/CPToolbar.j
index 49c78924e..8954c7160 100644
--- a/AppKit/CPToolbar.j
+++ b/AppKit/CPToolbar.j
@@ -459,11 +459,10 @@ var CPToolbarsByIdentifier              = nil,
 /* @ignore */
 - (id)_itemsWithIdentifiers:(CPArray)identifiers
 {
-    var items = [];
-    for (var i = 0; i < identifiers.length; i++)
-        [items addObject:[self _itemForItemIdentifier:identifiers[i] willBeInsertedIntoToolbar:NO]];
-
-    return items;
+    return [identifiers arrayByApplyingBlock:function(identifier, _)
+    {
+        return [self _itemForItemIdentifier:identifier willBeInsertedIntoToolbar:NO];
+    }];
 }
 
 /* @ignore */
diff --git a/AppKit/Platform/DOM/CPPlatformWindow+DOM.j b/AppKit/Platform/DOM/CPPlatformWindow+DOM.j
index bb183bd99..6d24c1985 100644
--- a/AppKit/Platform/DOM/CPPlatformWindow+DOM.j
+++ b/AppKit/Platform/DOM/CPPlatformWindow+DOM.j
@@ -1857,11 +1857,10 @@ function CPWindowObjectList()
 
 function CPWindowList()
 {
-    var windowObjectList = CPWindowObjectList(),
-        windowList = [];
+    var windowObjectList = CPWindowObjectList();
 
-    for (var i = 0, count = [windowObjectList count]; i < count; i++)
-        windowList.push([windowObjectList[i] windowNumber]);
-
-    return windowList;
+    return [windowObjectList arrayByApplyingBlock:function(windowObject, _)
+    {
+        return [windowObject windowNumber];
+    }];
 }
diff --git a/Foundation/CPAttributedString.j b/Foundation/CPAttributedString.j
index 04c131631..7badf601e 100755
--- a/Foundation/CPAttributedString.j
+++ b/Foundation/CPAttributedString.j
@@ -763,13 +763,10 @@
 - (void)setAttributedString:(CPAttributedString)aString
 {
     _string = aString._string;
-    _rangeEntries = [];
-
-    var i = 0,
-        count = aString._rangeEntries.length;
-
-    for (; i < count; i++)
-        _rangeEntries.push(copyRangeEntry(aString._rangeEntries[i]));
+    _rangeEntries = [aString._rangeEntries arrayByApplyingBlock:function(entry, _)
+    {
+        return copyRangeEntry(entry);
+    }];
 }
 
 //Private methods
diff --git a/Foundation/CPBundle.j b/Foundation/CPBundle.j
index 069e0e6eb..8c3ab2918 100644
--- a/Foundation/CPBundle.j
+++ b/Foundation/CPBundle.j
@@ -212,15 +212,12 @@ var CPBundlesForURLStrings = { };
 
 - (CPArray)staticResourceURLs
 {
-    var staticResourceURLs = [],
-        staticResources = _bundle.staticResources(),
-        index = 0,
-        count = [staticResources count];
+    var staticResources = _bundle.staticResources();
 
-    for (; index < count; ++index)
-        [staticResourceURLs addObject:staticResources[index].URL()];
-
-    return staticResourceURLs;
+    return [staticResources arrayByApplyingBlock:function(resource, _)
+    {
+        return resource.URL();
+    }];
 }
 
 - (CPArray)environments
diff --git a/Foundation/CPIndexSet.j b/Foundation/CPIndexSet.j
index c9f94fddb..e23f4a451 100644
--- a/Foundation/CPIndexSet.j
+++ b/Foundation/CPIndexSet.j
@@ -1018,14 +1018,13 @@ var CPIndexSetCountKey              = @"CPIndexSetCountKey",
     if (self)
     {
         _count = [aCoder decodeIntForKey:CPIndexSetCountKey];
-        _ranges = [];
 
-        var rangeStrings = [aCoder decodeObjectForKey:CPIndexSetRangeStringsKey],
-            index = 0,
-            count = rangeStrings.length;
+        var rangeStrings = [aCoder decodeObjectForKey:CPIndexSetRangeStringsKey];
 
-        for (; index < count; ++index)
-            _ranges.push(CPRangeFromString(rangeStrings[index]));
+        _ranges = [rangeStrings arrayByApplyingBlock:function(range, _)
+        {
+            return CPRangeFromString(range);
+        }];
     }
 
     return self;
diff --git a/Foundation/CPKeyedArchiver.j b/Foundation/CPKeyedArchiver.j
index e4e0d7bbd..7c074c383 100644
--- a/Foundation/CPKeyedArchiver.j
+++ b/Foundation/CPKeyedArchiver.j
@@ -380,12 +380,10 @@ var _CPKeyedArchiverStringClass                         = Nil,
 /* @ignore */
 - (void)_encodeArrayOfObjects:(CPArray)objects forKey:(CPString)aKey
 {
-    var i = 0,
-        count = objects.length,
-        references = [];
-
-    for (; i < count; ++i)
-        [references addObject:_CPKeyedArchiverEncodeObject(self, objects[i], NO)];
+    var references = [objects arrayByApplyingBlock:function(object, _)
+    {
+        return _CPKeyedArchiverEncodeObject(self, object, NO);
+    }];
 
     [_plistObject setObject:references forKey:aKey];
 }
diff --git a/Foundation/CPPredicate/_CPAggregateExpression.j b/Foundation/CPPredicate/_CPAggregateExpression.j
index 688166398..d3bdfc406 100644
--- a/Foundation/CPPredicate/_CPAggregateExpression.j
+++ b/Foundation/CPPredicate/_CPAggregateExpression.j
@@ -34,6 +34,7 @@
 
     if (self)
         _aggregate = collection;
+
     return self;
 }
 
@@ -55,41 +56,28 @@
 
 - (id)expressionValueWithObject:(id)object context:(CPDictionary)context
 {
-    var eval_array = [CPArray array],
-        collection  = [_aggregate objectEnumerator],
-        exp;
-
-    while ((exp = [collection nextObject]) !== nil)
+    return [_aggregate arrayByApplyingBlock:function(exp, _)
     {
-        var eval = [exp expressionValueWithObject:object context:context];
-        [eval_array addObject:eval];
-    }
-
-    return eval_array;
+        return [exp expressionValueWithObject:object context:context];
+    }];
 }
 
 - (CPString)description
-{
-    var i = 0,
-        count = [_aggregate count],
-        result = "{";
+{    
+    var descriptions = [_aggregate arrayByApplyingBlock:function(exp, _)
+    {
+        return [exp description];
+    }];
 
-    for (; i < count; i++)
-        result = result + [CPString stringWithFormat:@"%s%s", [[_aggregate objectAtIndex:i] description], (i + 1 < count) ? @", " : @""];
-
-    result = result + "}";
-
-    return result;
+    return "{" + [descriptions componentsJoinedByString:","] + "}" ;
 }
 
 - (CPExpression)_expressionWithSubstitutionVariables:(CPDictionary)variables
 {
-    var subst_array = [CPArray array],
-        count = [_aggregate count],
-        i = 0;
-
-    for (; i < count; i++)
-        [subst_array addObject:[[_aggregate objectAtIndex:i] _expressionWithSubstitutionVariables:variables]];
+    var subst_array = [_aggregate arrayByApplyingBlock:function(exp, _)
+    {
+        return [exp _expressionWithSubstitutionVariables:variables];
+    }];
 
     return [CPExpression expressionForAggregate:subst_array];
 }
diff --git a/Foundation/CPPredicate/_CPFunctionExpression.j b/Foundation/CPPredicate/_CPFunctionExpression.j
index 394c93612..b0d854dd9 100644
--- a/Foundation/CPPredicate/_CPFunctionExpression.j
+++ b/Foundation/CPPredicate/_CPFunctionExpression.j
@@ -143,11 +143,10 @@
 - (CPExpression)_expressionWithSubstitutionVariables:(CPDictionary)variables
 {
     var operand = [[self operand] _expressionWithSubstitutionVariables:variables],
-        args = [CPArray array],
-        i = 0;
-
-    for (; i < _argc; i++)
-        [args addObject:[_arguments[i] _expressionWithSubstitutionVariables:variables]];
+        args = [_arguments arrayByApplyingBlock:function(arg, _)
+        {
+            return [arg _expressionWithSubstitutionVariables:variables];
+        }];
 
     return [CPExpression expressionForFunction:operand selectorName:[self _function] arguments:args];
 }