Added max & min method

Underscore/USArrayWrapper.h

@@ -61,6 +61,9 @@
 
 @property (readonly) USArrayWrapper *uniq;
 
+@property (readonly) id (^min)(UnderscoreValueBlock block);
+@property (readonly) id (^max)(UnderscoreValueBlock block);
+
 @property (readonly) id (^find)(UnderscoreTestBlock block);
 
 @property (readonly) USArrayWrapper *(^filter)(UnderscoreTestBlock block);

Underscore/USArrayWrapper.m

@@ -258,6 +258,45 @@ - (USArrayWrapper *)uniq
     return [[USArrayWrapper alloc] initWithArray:[set array]];
 }
 
+- (id (^)(UnderscoreValueBlock))min
+{
+    return ^id (UnderscoreValueBlock test) {
+
+        if( !test ) return [self.array valueForKeyPath:@"@min.doubleValue"];
+
+        id result = nil;
+        NSNumber *minValue = nil;
+        for (id obj in self.array) {
+            NSNumber *value = test(obj);
+
+            if( !minValue ) minValue = value, result = obj;
+            else if( [minValue compare:value] == NSOrderedDescending ) minValue = value, result = obj;
+        }
+
+        return result;
+    };
+}
+
+- (id (^)(UnderscoreValueBlock))max
+{
+    return ^id (UnderscoreValueBlock test) {
+
+        if( !test ) return [self.array valueForKeyPath:@"@max.doubleValue"];
+
+        id result = nil;
+        NSNumber *maxValue = nil;
+        for (id obj in self.array) {
+            NSNumber *value = test(obj);
+
+            if( !maxValue ) maxValue = value, result = obj;
+            else if( [maxValue compare:value] == NSOrderedAscending ) maxValue = value, result = obj;
+        }
+
+        return result;
+    };
+}
+
+
 - (id (^)(UnderscoreTestBlock))find
 {
     return ^id (UnderscoreTestBlock test) {

Underscore/USConstants.h

@@ -26,6 +26,8 @@
 
 #import <Foundation/Foundation.h>
 
+
+typedef id   (^UnderscoreValueBlock)(id obj);
 typedef BOOL (^UnderscoreTestBlock)(id obj);
 typedef id   (^UnderscoreReduceBlock)(id memo, id obj);
 

Underscore/Underscore+Functional.m

@@ -149,6 +149,13 @@ @implementation Underscore (Functional)
     };
 }
 
++ (id (^)(NSArray *, UnderscoreValueBlock))max
+{
+    return ^(NSArray *array, UnderscoreValueBlock block) {
+        return Underscore.array(array).max(block);
+    };
+}
+
 + (id (^)(NSArray *, UnderscoreTestBlock))find
 {
     return ^(NSArray *array, UnderscoreTestBlock block) {
@@ -162,6 +169,7 @@ @implementation Underscore (Functional)
         return Underscore.array(array).filter(block).unwrap;
     };
 }
+
 + (NSArray *(^)(NSArray *, UnderscoreTestBlock))reject
 {
     return ^(NSArray *array, UnderscoreTestBlock block) {

UnderscoreTests/USArrayTest.m

@@ -643,4 +643,43 @@ - (void)testSort
                          _.array(notSorted).sort(numericalSort).unwrap);
 }
 
+- (void)testMin
+{
+    NSDictionary *dict = @{@"name": @"mark", @"value" : @2};
+
+    NSArray *dictArray    = @[ @{@"name": @"python", @"value" : @3}, @{@"name": @"monthy", @"value" : @3.3}, @{@"name": @"mark", @"value" : @2} ];
+    NSArray *numbersArray   = @[ @100, @3.3, @3 ];
+
+    UnderscoreValueBlock minBlock1 = ^id(NSDictionary *dict){ return dict[@"value"]; };
+    UnderscoreValueBlock minBlock2 = nil;
+
+
+    STAssertEqualObjects(_.array(dictArray).min(minBlock1),
+                         dict,
+                         @"Can find min element");
+
+    STAssertEqualObjects(_.array(numbersArray).min(minBlock2),
+                         @3,
+                         @"Can find min element");
+}
+
+- (void)testMax
+{
+    NSDictionary *dict = @{@"name": @"monthy", @"value" : @3.3};
+
+    NSArray *dictArray    = @[ @{@"name": @"python", @"value" : @3}, @{@"name": @"monthy", @"value" : @3.3}, @{@"name": @"mark", @"value" : @2} ];
+    NSArray *numbersArray   = @[ @100, @3.3, @3 ];
+
+    UnderscoreValueBlock maxBlock1 = ^id(NSDictionary *dict){ return dict[@"value"]; };
+    UnderscoreValueBlock maxBlock2 = nil;
+
+    STAssertEqualObjects(_.array(dictArray).max(maxBlock1),
+                         dict,
+                         @"Can find max element");
+
+    STAssertEqualObjects(_.array(numbersArray).max(maxBlock2),
+                         @100,
+                         @"Can find max element");
+}
+
 @end