Function averageBy

averageBy<T, K extends string | number | symbol>(
array: readonly T[],
key: K,
): number
Returns the average of a numeric key across all items. Items where the key value is not a number are skipped. Returns 0 for an empty array.
Type Parameters
- T
- K extends string | number | symbol
Parameters
- array: readonly T[]
  The array to average.
- key: K
  The numeric key to average by.
Returns number
Example
```
averageBy([{ score: 10 }, { score: 20 }, { score: 30 }], "score") // => 20
averageBy([], "score") // => 0
```
- Defined in array/averageBy/index.ts:19