# Learn Intermediate Algorithmic Thinking by Building a Dice Game - Step 42

### Tell us what’s happening:

If the user rolls a `"Three of a kind"` or `"Four of a kind"`, then they will receive a score totalling the sum of all five dice values.

Use the `reduce` method on `diceValuesArr`. For the callback function, use `a` and `b` as parameters. Within the callback function, return the sum of `a` and `b`. For the initial value, use the number `0`.

Finally, assign the entire result to a `const` variable called `sumOfAllDice`.

Im getting this error =>
You should return the sum of `a` and `b` within the callback function.

``````diceValuesArr.reduce((a,b) => {
const sumOfAllDice = 0;
return a + b;
}, 0)
``````

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