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r-plus/gist:8934385

Created February 11, 2014 12:58
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gistfile1.m
@implementation NSArray(ValueAtIndex)
- (NSArray *)valueAtIndex:(NSUInteger)index
{
NSMutableArray *array = [NSMutableArray array];
for (NSArray *a in self)
if (a.count >= index + 1)
[array addObject:a[index]];
return [NSArray arrayWithArray:array];
}
@end
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