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Added eachWithIndex: and mapWithIndex: method to iterate arrays#339

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Added eachWithIndex: and mapWithIndex: method to iterate arrays#339
draveness wants to merge 1 commit intoBlocksKit:masterfrom
draveness:master

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@draveness draveness commented Mar 8, 2016

Sometimes iterate array need index which is similar with ruby syntax like this:

    NSMutableArray *prompts = [@[@"time", @"score", @"fan"] mutableCopy];
    [promptLabels bk_each:^(UILabel *promptLabel, NSUInteger index) {
        promptLabel.text = prompts[index];
    }];

Thx for ur great lib

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