How to find greatest numeric value in Array of string in objective-c?

Question

I have an array of strings

NSArray *myNumbers = @[@"0.0454", @"-1.3534", @"0.345",
                             @"65", @"-0.345", @"1.35"];

How can I find the greatest numeric value (65) from this array of string?

Is there any default method or workaround for this?

Answer 1

Just sort it while converting to float, then get the first or last value depends on your sort

NSString *max = [myNumbers sortedArrayUsingComparator:^NSComparisonResult(id a, id b) {
        float first = [(NSString*)a floatValue];
        float second = [(NSString*)b floatValue];
        if (first > second)
            return NSOrderedAscending;
        else if (first < second)
            return NSOrderedDescending;
        return NSOrderedSame;
    }][0];

or

NSString *max = [[myNumbers sortedArrayUsingComparator:^NSComparisonResult(id a, id b) {
        return [(NSString *)a compare:(NSString *)b options:NSNumericSearch];
    }] lastObject];