Fast Enumeration Best Techniques following Nick Lockwood article: http://iosdevelopertips.com/objective-c/high-performance-collection-looping-objective-c.html

High Performance Collection Looping

    // Fast Enumeration Best Techniques:
    // Following Nick Lockwood article: http://iosdevelopertips.com/objective-c/high-performance-collection-looping-objective-c.html?utm_source=iOSDevTips&utm_campaign=wordtwit&utm_medium=twitter

    // NSArray Fast Enumeration

    NSMutableArray *array;
    for (<#type *object#> in array) {
        <#statements#>
    }

    for (<#type *object#> in [array reverseObjectEnumerator]) {
        <#statements#>
    }

    // Need index or modify array
    NSUInteger count = [array count];
    for (NSUInteger i = 0; count; i++) {
        <#statements#>
    }

    // if your code might benefit from parallel execution
    [array enumerateObjectsWithOptions:NSEnumerationConcurrent
                            usingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
                                <#statements#>
                            }];

    // NSSet Fast Enumeration

    NSSet *set;
    for (<#type *object#> in set) {
        <#statements#>
    }

    // Need modify set
    for (<#type *object#> in [set reverseObjectEnumerator]) {
        <#statements#>
    }

    // if your code might benefit from parallel execution
    [set enumerateObjectsWithOptions:NSEnumerationConcurrent
                            usingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
                                <#statements#>
                            }];


    // NSDictionary Fast Enumeration

    NSDictionary *dictionary;
    [dictionary enumerateKeysAndObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
        <#statements#>
    }];

    // Need modify dictionary
    for (id key in [dictionary allKeys]) {
        <#statements#>
    }

    // if your code might benefit from parallel execution
    [dictionary enumerateKeysAndObjectsWithOptions:NSEnumerationConcurrent
                          usingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
                              <#statements#>
                          }];