Collection

Collection helper imitates the Linq in .Net to provide such Where, Any, Skip, and other assisting functions for NSArray and NSDictionary.

Where example

    NSArray* _list = @[@1,@2,@3,@4,@5,@6,@7,@8,@9,@10];
            //convert the type of x to your item's type
    NSArray* result = [_list A_Where:^bool(NSNumber* x) {
        return [x integerValue] > 5;
    }];
    // result: 6,7,8,9,10
    

Any example

    NSArray* _list = @[@1,@2,@3,@4];
    [_list A_Any:^bool(NSNumber* x) {
        return [x integerValue] % 2 == 0;
    }]; // return YES
    [_list A_Any:^bool(NSNumber* x) {
        return [x integerValue] % 5 == 0;
    }]; // return NO
        

Skip and Take Example

    NSArray* _list = @[@1,@2,@3,@4,@5,@6,@7,@8,@9,@10];
    NSArray* result = [[_list A_Skip:4] A_Take:3];
    // result:5,6,7
        

Reverse example

    NSArray* _list = @[@1,@2,@3,@4,@5,@6,@7,@8,@9,@10];
    NSArray* _test = [_list A_Reverse];
    // result: 10,9,8,7,6,5,4,3,2,1
        

Swap example

    NSMutableArray* demo1 = [[NSMutableArray alloc] initWithArray:@[@"A",@"B",@"C"]];
    NSMutableArray* demo2 = [[NSMutableArray alloc] initWithArray:@[@"1",@"2",@"3"]];

    [demo1 A_Swap:demo2];
    // demo1: 1,2,3
    // demo2: A,B,C

First and last match Example

    NSArray* _list = @[@1,@2,@3,@4,@5,@6,@7,@8,@9,@10];
    NSNumber* _first = [_list A_FirstOrNil:^bool(NSNumber* x) {
        return [x integerValue] % 2 ==0;
    }]; // _first: 2
    NSNumber* _last = [_list A_LastOrNil:^bool(NSNumber* x) {
        return [x integerValue] % 2 ==0;
    }]; // _last: 10
        

Combine array to dictionary Example

    NSArray* _list = @[@"A",@"B",@"C"];
    NSDictionary* result1 = [_list A_CombineKeys:@[@1,@2,@3]];
    // result1: 1:A 2:B 3:C

    NSDictionary* result1 = [_list A_CombineValues:@[@1,@2,@3]];
    // result2: A:1 B:2 C:3