HighestNumberInArray.m

//
//  main.m
//  Stretch Problem 4.3 - HighestNumberInArray
//
//  Created by theevo on 3/25/20.
//  Copyright © 2020 Theo Vora. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface PlaygroundClass : NSObject

-(id) highestNumber:(NSArray *)inputArray;

@end

@implementation PlaygroundClass

-(id) highestNumber:(NSArray *)inputArray
{
    NSSortDescriptor *sortOrder = [NSSortDescriptor sortDescriptorWithKey:@"self" ascending:NO];
    
    NSArray *sortedArray = [inputArray sortedArrayUsingDescriptors: [NSArray arrayWithObject: sortOrder]];
    
    return [sortedArray firstObject];
}

@end

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        
        NSArray *array = @[@1,@2,@3];
        id i;
        
        PlaygroundClass *playground = [[PlaygroundClass alloc]init];
        i = [playground highestNumber:array];
        
        NSLog(@"Highest number in %@ is... %@", array, i);
        
        NSLog(@"Hello, World!");
    }
    return 0;
}