如何检查较小数组中的值是否在较大数组中？

发布于 2024-11-30 10:44:32 字数 311 浏览 0 评论 0原文

我有两个数组：

符号 - 较小的数组 fetchedSymbolsArray - 更大的数组

如何检查符号中的内容是否也在 fetchedSymbolsArray 内？

假设

symbols = ["AAPL", "GOOG", "YHOO"];
fetchedSymbolsArray = ["AAPL", "GOOG", "YHOO", "MSFT"];

我想检查是否有重复项，然后将 fetchedSymbolsArray 中的任何其他元素添加回符号中。在这种情况下，将添加 MSFT。

原文

I have two arrays:

symbols - smaller array
fetchedSymbolsArray - larger array

How can I check to see if the contents in symbols is also inside of fetchedSymbolsArray?

Lets assume

symbols = ["AAPL", "GOOG", "YHOO"];
fetchedSymbolsArray = ["AAPL", "GOOG", "YHOO", "MSFT"];

I want to check to see for duplicates, and then add any additional elements in fetchedSymbolsArray back into symbols. In this case, MSFT would be added.

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半城柳色半声笛 2024-12-07 10:44:32

试试这个。

BOOL contentIsInLargerArray = NO;
for (id *object in symbols) {
    if ([fetchedSymbolsArray containsObject:object])
        contentIsInLargerArray = YES;
}
return contentIsInLargerArray;

这使用 -(BOOL)containsObject:(id)anObject 而不是 -[indexObObject:]。

try this.

BOOL contentIsInLargerArray = NO;
for (id *object in symbols) {
    if ([fetchedSymbolsArray containsObject:object])
        contentIsInLargerArray = YES;
}
return contentIsInLargerArray;

This uses -(BOOL)containsObject:(id)anObject instead of -[indexObObject:].

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醉梦枕江山 2024-12-07 10:44:32

您可以使用NSArray方法

- (NSUInteger)indexOfObject:(id)anObject

来测试数组是否具有某个对象。如果没有，返回结果将为NSNotFound。这是检查一个数组是否是另一个数组的子集的简单方法：

NSUInteger index;
for (int i=0; i<[symbols count]; ++i) {
    index = [fetchedSymbolsArray indexOfObject:[symbols objectAtIndex:i]];
    if (index == NSNotFound) {
        return NO;
    }
}
return YES;

当然，可以使用快速枚举或其他技巧来改进，具体取决于数组中的对象、它们是否已排序等。

You can use the NSArray method

- (NSUInteger)indexOfObject:(id)anObject

to test whether or not an array has a certain object. If not, the return result will be NSNotFound. Here's simple way to check if one array is a subset of another:

NSUInteger index;
for (int i=0; i<[symbols count]; ++i) {
    index = [fetchedSymbolsArray indexOfObject:[symbols objectAtIndex:i]];
    if (index == NSNotFound) {
        return NO;
    }
}
return YES;

Of course, this can be improved using fast enumeration or other tricks depending on the objects in the arrays, whether they are sorted, etc.

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请你别敷衍 2024-12-07 10:44:32

for (int i = 0; i<[symbols count]; i++) {
    id myObj = [symbols objectAtIndex:i]; // I set id because type is unknown
    if ([fetchedSymbolsArray indexOfObject:myObj] != NSNotFound) {
        NSLog(@"Object %@ found in fetched symbols", myObj);
    }
}

for (int i = 0; i<[symbols count]; i++) {
    id myObj = [symbols objectAtIndex:i]; // I set id because type is unknown
    if ([fetchedSymbolsArray indexOfObject:myObj] != NSNotFound) {
        NSLog(@"Object %@ found in fetched symbols", myObj);
    }
}

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