String Search in two arrays in Objective C

Question

I have this all country array in my code. i want to go through that array comparing another second array that to check it contains country name.

Example

NSString *str=@"Afghanistan, Albania, Algeria, American Samoa, Andorra, Angola, Anguilla, Antarctica,"; 
NSArray *arr = [str componentsSeparatedByString:@","];


NSString *myStr = "Toyota, Nissan, Bottle, Albania, Pen, Bag";
NSArray *myarr = [myStr componentsSeparatedByString:@","];

I want to compare this and if there is Country Name in MyStringArray that match with CountryArray[]then assign to string.

@Arc676 i made it for demonstration purpose only to get the idea. there will be only one country in my array — Im Batman, Nov 06 '15 at 09:28
you want to to get the common country names from two arrays? — Anshad Rasheed, Nov 06 '15 at 09:31
Possible duplicate of [Finding Intersection of NSMutableArrays](http://stackoverflow.com/questions/6023548/finding-intersection-of-nsmutablearrays) — KIDdAe, Nov 06 '15 at 09:32
for (NSString *strObject in MyStringArray) { if ([CountryArray containsObject:strObject]) { NSLog(strObject); } } — Mrs. Agrawal, Nov 06 '15 at 09:37

tuledev · Answer 1 · 2015-11-06T09:58:09.287

4

int originLength = MyStringArray.count;

NSMutableArray *arr = [NSMutableArray arrayWithArray:MyStringArray];
[arr removeObjectsInArray: CountryArray];
int diff = [arr count];

if (originLength == diff) {
/// all diff
}
else {
}

edited Nov 06 '15 at 09:58

answered Nov 06 '15 at 09:33

tuledev

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score 2 · Answer 2 · answered Nov 06 '15 at 09:33

EDIT: never mind, use the other answer; it's better. I'll leave this here as an alternative method.

You can loop through the elements in MyStringArray and use [NSArray contains:] to check for the presence of the elements.

NSMutableArray *commonItems;
for (String *str in MyStringArray){
    if ([Country containsObject:str]){
        //Both arrays contains str
        [commonItems addObject:str];
    }
}
//commonItems now contains the country

I used an array because you didn't specify how many common items there might be.

Also, in componentsSeparatedByString should have @", " (mind the space)

Yes. that is very helpful for if i dont know how many common items there will be. Thanks — Im Batman, Nov 06 '15 at 09:40

score 2 · Accepted Answer · answered Nov 06 '15 at 09:35

The other answers will work but there is an NSArray method which makes this trivial:

NSArray *countryNamesArray = @[@"Australia", @"Japan", @"Sweden"];
NSArray *arrayContainingOneCountryName = @[@"Dog", @"Felafel", @"Australia"];

NSString *matchingCountry = [arrayContainingOneCountryName firstObjectCommonWithArray:countryNamesArray];
NSLog(@"%@", matchingCountry);

String Search in two arrays in Objective C

3 Answers3