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# How bad did I miss the result?

```// Enter your code below
func isOdd(num: number) -> Bool {
var odd = numbers.map({ \$0 % 3 == 0 })
return odd
}
```

This is my try. What did I do wrong?

Woah, I have been summoned! I haven't taken this course yet but I went ahead and took a look at the challenge. It looks like you are on the right track, but there are a couple things that are throwing off your code. The first is that "number" isn't a variable type that swift recognizes, so I would try using "Int". Next, the problem is asking you to write a function that will examine one number at time, not an array, so the first line of the function should be called on "num". The last point is that determining whether a number is odd or even is a matter of whether or not is divisible by 2. So that logic test should look at whether num % 2 is 1 or 0. Putting everything together to modify your function would look like this:

```func isOdd(num: Int) -> Bool {
var odd = num % 2 == 1
return odd
}
```

Hope this helps!

Hi, thanks for answering. I haven't had a chance to test this code, but I will.

I'm late to the party, but Max is right! The function can also be written even more concisely like this:

```func isOdd(num: Int) -> Bool {
return num % 2 == 1
}
```

That's right, you don't even need to store the "oddness" of the number in a variable if all you're going to do is return it.

Also, keep in mind that the `map` function applies a given function to every element in an array and returns that array. Your `isOdd` function is supposed to return a (single) `Bool`, so that's why the compiler is giving you an error.