Function sumBy

sumBy<T, K extends string | number | symbol>(
array: readonly T[],
key: K,
): number
Returns the sum of a numeric key across all items. Items where the key value is not a number are skipped.
Type Parameters
- T
- K extends string | number | symbol
Parameters
- array: readonly T[]
  The array to sum.
- key: K
  The numeric key to sum by.
Returns number
Example
```
sumBy([{ price: 10 }, { price: 20 }, { price: 30 }], "price") // => 60
sumBy([], "price") // => 0
```
- Defined in array/sumBy/index.ts:18