Find value in Array in objective C

Question

I have a NSArray structure likes this {w123,123,234,345,w124,234,235,w125,234,453,435,....}

What I am trying to do is to specify which one begins with "w" then do something But I don't know how to do that in objective C, anyone can help? Thanks in advance.

DarkDust · Accepted Answer · 2011-07-12 12:01:18Z

5

for (NSString *text in myArray) {
    if ([text hasPrefix:@"w"]) {
       // Do something.
    }
}

answered Jul 12, 2011 at 12:01

DarkDust

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EmptyStack · Accepted Answer · 2011-07-12 12:21:00Z

3

You can use NSPredicate.

NSString *searchStr = @"w";  // or something else
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"self BEGINSWITH[cd] %@", searchStr];
NSArray *resultArray = [mainArray fileteredArrayUsingPredicate:predicate];

The resultArray will contain all the strings that start with searchStr(@"w", in this case).

Case sensitivity: Here c and d are used for case and diacritic insensitivity.

String comparisons are by default case and diacritic sensitive. You can modify an operator using the key characters c and d within square braces to specify case and diacritic insensitivity respectively.

edited Jul 12, 2011 at 12:21

answered Jul 12, 2011 at 12:04

EmptyStack

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Comments

KingofBliss · Accepted Answer · 2011-07-12 12:13:33Z

1

Code as,

for(NSString * str in array)
{
 if([str hasPrefix:@"w"])
   //Do something
}

edited Jul 12, 2011 at 12:13

answered Jul 12, 2011 at 12:01

KingofBliss

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1 Comment

KingofBliss Over a year ago

Dont use characterAtIndex method, if there is a string with length 0, the app will crash. So im editing my answer

Mikayil Abdullayev · Accepted Answer · 2011-07-12 12:03:02Z

0

I guess the best option would be to iterate through the array and check if that string begins with "w".

answered Jul 12, 2011 at 12:03

Mikayil Abdullayev

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