配列に要素を追加する
[php]
NSMutableArray *happy2 = [NSMutableArray array];
[happy2 addObject:@"odiejs"];
[happy2 addObjectsFromArray:@[@"dkdiaha", @"idos"]];
NSLog(@"%@", happy2);
[/php]

乱数の入った配列を作る
[php]
NSMutableArray *happy3 = [NSMutableArray array];
NSInteger v;
for (int i=0; i<20; i++) {
v = arc4random() % 10;
[happy3 addObject:@(v)];
}
NSLog(@"%@", happy3);
[/php]

配列に値を挿入
[php]
NSMutableArray *fruits = [NSMutableArray arrayWithArray:@[@"apple", @"orange"]];
[fruits insertObject:@"strawberry" atIndex:0];
NSLog(@"%@", fruits);
[/php]

配列から値を削除する
[php]
NSArray *fruitsSet = [NSMutableArray arrayWithArray:@[@"kokoa", @"gor", @"jojo", @"iii"]];
NSMutableArray *fruits = [NSMutableArray arrayWithArray: fruitsSet];
[fruits removeObjectAtIndex:2];
[fruits removeObject:@"kokoa"];
NSLog(@"%@", fruits);
[/php]