Function interpolate

interpolate(
arr: (number | null | undefined)[],
type?: "linear" | "quadratic",
): number[]
Interpolates missing values (null or undefined) in an array using linear or quadratic interpolation.
Parameters
- arr: (number | null | undefined)[]
  The array with missing values
- Optionaltype: "linear" | "quadratic" = "linear"
  The interpolation method, either "linear" or "quadratic"
Returns number[]
Example
```
const result = Chalkboard.stat.interpolate([1, null, 9], "linear"); // Returns [1, 5, 9]
```
- Defined in Chalkboard.stat.ts:613