---
title: Use the d3.max and d3.min Functions to Find Minimum and Maximum Values in a Dataset
## Use the d3.max and d3.min Functions to Find Minimum and Maximum Values in a Dataset
### Hint 1
Use the `d3.max()` function.
### Hint 2
Use a callback function.
### Hint 3
Check for the second element in the callback function's array.
### Solution
To solve the solution, you code should look like this, this would check for the `z` co-ordinate i.e. the third element in the array which would be at an index of 2:
```javascript
<body>
<script>
const positionData = [[1, 7, -4],[6, 3, 8],[2, 8, 3]]
const output = d3.max(positionData, (d) => d[2]);
d3.select("body")
.append("h2")
.text(output)
</script>
</body>
```
