比较值的NSMutableArray元素 [英] Comparing NSMutableArray Elements for Values
问题描述
我正在寻找一种方法来比较两个NSMutableArray对象的内容。这两个数组都用单独分配的NSMutableDictionaries填充,但偶尔包含相同的数据。
简化示例:
NSMutableArray * firstArray = [[NSMutableArray alloc] init];
NSMutableArray * secondArray = [[NSMutableArray alloc] init];
NSMutableDictionary * a = [[NSDictionary alloc] init];
[a setObject:@fooforKey:name];
[a setObject:[NSNumber numberWithInt:1] forKey:number];
NSMutableDictionary * b = [[NSDictionary alloc] init];
[b setObject:@barforKey:name];
[b setObject:[NSNumber numberWithInt:2] forKey:number];
NSMutableDictionary * c = [[NSDictionary alloc] init];
[c setObject:@fooforKey:name];
[c setObject:[NSNumber numberWithInt:1] forKey:number];
[firstArray addObject:a];
[firstArray addObject:b];
[secondArray addObject:c];
a,b和c是不同的对象,但a和c的内容匹配。 >
我正在寻找的是一个函数/方法来比较firstArray和secondArray,只返回b。
在Pseudocode中:
NSArray * difference = [self magicFunctionWithArray:firstArray andArray:secondArray];
NSLog(@%@,difference)
=> ({name =bar; number = 2})
>
这可以通过使用 NSMutableSet
实例来实现。
NSMutableSet * firstSet = [NSMutableSet setWithArray:firstArray];
NSMutableSet * secondSet = [NSMutableSet setWithArray:firstArray];
[firstSet unionSet:[NSSet setWithArray:secondArray]];
[secondSet intersectSet:[NSSet setWithArray:secondArray]];
[firstSet minusSet:secondSet];
NSLog(@%@,firstSet);
I am looking for a way to compare the contents of two NSMutableArray objects. Both arrays are filled with NSMutableDictionaries which were allocated separately but occasionally contain the same data.
Simplified Example:
NSMutableArray *firstArray = [[NSMutableArray alloc] init];
NSMutableArray *secondArray = [[NSMutableArray alloc] init];
NSMutableDictionary *a = [[NSDictionary alloc] init];
[a setObject:@"foo" forKey:"name"];
[a setObject:[NSNumber numberWithInt:1] forKey:"number"];
NSMutableDictionary *b = [[NSDictionary alloc] init];
[b setObject:@"bar" forKey:"name"];
[b setObject:[NSNumber numberWithInt:2] forKey:"number"];
NSMutableDictionary *c = [[NSDictionary alloc] init];
[c setObject:@"foo" forKey:"name"];
[c setObject:[NSNumber numberWithInt:1] forKey:"number"];
[firstArray addObject:a];
[firstArray addObject:b];
[secondArray addObject:c];
a, b and c are distinct object, but the contents of a and c match.
What I am looking for is a function / approach to compare firstArray and secondArray and return only b.
In Pseudocode:
NSArray *difference = [self magicFunctionWithArray:firstArray andArray:secondArray];
NSLog(@"%@",difference)
=> ({name="bar"; number=2})
Thank you in advance.
This can be achieved using NSMutableSet
instances.
NSMutableSet * firstSet = [NSMutableSet setWithArray:firstArray];
NSMutableSet * secondSet = [NSMutableSet setWithArray:firstArray];
[firstSet unionSet:[NSSet setWithArray:secondArray]];
[secondSet intersectSet:[NSSet setWithArray:secondArray]];
[firstSet minusSet:secondSet];
NSLog(@"%@", firstSet);
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