CODEWITHSUNDEEP
objective-csearchnsarray
MoKaM
MoKaM

Reputation: 423

Searching NSArray using suffixes

I have a word list stored in an NSArray, I want to find all the words in it with the ending 'ing'.

Could someone please provide me with some sample/pseudo code.

Upvotes: 1

Views: 315

Answers (4)

Abizern
Abizern

Reputation: 150565

Let's say you have an array defined:

NSArray *wordList = // you have the contents defined properly

Then you can enumerate the array using a block

// This array will hold the results.
NSMutableArray *resultArray = [NSMutableArray new];

// Enumerate the wordlist with a block
[wordlist enumerateObjectsUsingBlock:(id obj, NSUInteger idx, BOOL *stop) {
    if ([obj hasSuffix:@"ing"]) {
        // Add the word to the result list
        [result addObject:obj];
    }
}];

// resultArray now has the words ending in "ing"

(I am using ARC in this code block)

I am giving an example using blocks because its gives you more options should you need them, and it's a more modern approach to enumerating collections. You could also do this with a concurrent enumeration and get some performance benefits as well.

Upvotes: 4

Luke
Luke

Reputation: 11476

NSMutableArray *results = [[NSMutableArray alloc] init];

// assuming your array of words is called array:
for (int i = 0; i < [array count]; i++)
{
    NSString *word = [array objectAtIndex: i];
    if ([word hasSuffix: @"ing"])
        [results addObject: word];
}

// do some processing

[results release]; // if you're not using ARC yet.

Typed from scratch, should work :)

Upvotes: 1

DrummerB
DrummerB

Reputation: 40211

Use NSPredicate to filter NSArrays.

NSArray *array = @[@"test", @"testing", @"check", @"checking"];
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF ENDSWITH 'ing'"];
NSArray *filteredArray = [array filteredArrayUsingPredicate:predicate];

Upvotes: 8

dom
dom

Reputation: 11962

Just loop through it and check the suffixes like that:

for (NSString *myString in myArray) {
  if ([myString hasSuffix:@"ing"]){
    // do something with myString which ends with "ing"
  }
}

Upvotes: 2

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