sortSpeciesByTeeth(); undefined error

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1

I feel like I keep popping on here with increasingly boring questions, but I am stumped. Why am I getting an undefined log on the console for this?

const sortSpeciesByTeeth = arr => {
  arr.sort((a, b) =>  a.numTeeth - b.numTeeth
  )
};

The only thing I can figure is that it’s my a and b variables, but I’m not sure how to define them given that they’re referring to the various objects in the array.

Thank you for any guidance you can give.

2

Hello! Could you post the full code, and the exact error, please?

3

Sure, of course:

const speciesArray = [ {speciesName:'shark', numTeeth:50}, {speciesName:'dog', numTeeth:42}, {speciesName:'alligator', numTeeth:80}, {speciesName:'human', numTeeth:32}];

const sortSpeciesByTeeth = arr => {
  arr.sort((a, b) =>  a.numTeeth - b.numTeeth
  )
};

This was for the Intermediate JavaScript challenges. The goal is to sort the species listed by the numTeeth value. It keeps returning undefined and I can’t figure out why. I

In the exercise, I changed the operator from the - to the > and it functions to sort, but I don’t understand why this code as-is returns undefined.

4

Sorry for the really late reply; I’ve been away from the screen for a while. I’ll try to get back to you with a real answer soon, if you’re still interested.

5

Not to worry; I am still interested, but I understand that life can get in the way! Thank you for getting back to me :slight_smile:

1 Like
6

Could you post the code that works for you, and the output, please? When I run it with the - operator, it works, where it doesn’t when I use the > operator…

7 
type or paste code here
```const speciesArray = [ {speciesName:'shark', numTeeth:50}, {speciesName:'dog', numTeeth:42}, {speciesName:'alligator', numTeeth:80}, {speciesName:'human', numTeeth:32}];

// Write your code here:

const sortSpeciesByTeeth = arr => 
  arr.sort((a, b) =>  a.numTeeth > b.numTeeth
  );


console.log(sortSpeciesByTeeth(speciesArray))

Prints, as requested:
// [ { speciesName: 'human', numTeeth: 32 },

//   { speciesName: 'dog', numTeeth: 42 },

//   { speciesName: 'shark', numTeeth: 50 },

//   { speciesName: 'alligator', numTeeth: 80 } ]
8

I tried the minus again after you said it was working, and it worked this time. I was sure I just changed the operator…how frustrating.

Thank you so much for chasing this down and trying. Seems like the moral of the story is that it works fine and I just need to read closer?

1 Like