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Added mapWithIndex category method for NSArray #6

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Added mapWithIndex category method for NSArray #6

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2 changes: 2 additions & 0 deletions UsefulBits/Foundation/NSArray+Blocks.h
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Original file line number Diff line number Diff line change
Expand Up @@ -45,6 +45,8 @@

- (NSArray *)map:(id (^)(id item))block;
- (NSArray *)map:(id (^)(id item))block filterNil:(BOOL)filter_nil;
- (NSArray *)mapWithIndex:(id (^)(id item, NSUInteger index))block;
- (NSArray *)mapWithIndex:(id (^)(id item, NSUInteger index))block filterNil:(BOOL)filter_nil;
- (id)reduce:(id (^)(id current, id item))block initial:(id)initial;
- (NSArray *)intersperse:(id (^) (id current, id next))separator;

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23 changes: 18 additions & 5 deletions UsefulBits/Foundation/NSArray+Blocks.m
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Expand Up @@ -153,13 +153,26 @@ - (NSArray *)map:(id (^)(id item))block;
}

- (NSArray *)map:(id (^)(id item))block filterNil:(BOOL)filter_nil;
{
return [self mapWithIndex:^id(id item, NSUInteger index) {
return block(item);
} filterNil:filter_nil];
}

- (NSArray *)mapWithIndex:(id (^)(id item, NSUInteger index))block;
{
return [self mapWithIndex:block filterNil:YES];
}

- (NSArray *)mapWithIndex:(id (^)(id item, NSUInteger index))block filterNil:(BOOL)filter_nil;
{
NSMutableArray *result = [NSMutableArray arrayWithCapacity:[self count]];
for (id obj in self)

for (NSUInteger idx = 0; idx < [self count]; idx++)
{
id instance = block(obj);

id obj = [self objectAtIndex:idx];
id instance = block(obj, idx);

if (nil != instance)
{
[result addObject:instance];
Expand All @@ -169,7 +182,7 @@ - (NSArray *)map:(id (^)(id item))block filterNil:(BOOL)filter_nil;
[result addObject:[NSNull null]];
}
}

return [NSArray arrayWithArray:result];
}

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