Function sumOf

sumOf<T>(array, selector): number
Applies the given selector to all elements in the given collection and calculates the sum of the results.
Type Parameters
- T
  The type of the array elements.
Parameters
- array: Iterable<T, any, any>
  The array to calculate the sum of.
- selector: ((el: T) => number)
  The selector function to get the value to sum.
  - - (el): number
    - Parameters
      el: T
      Returns number
Returns number
The sum of all elements in the collection.
Example: Basic usage
```
import { sumOf } from "@std/collections/sum-of";
import { assertEquals } from "@std/assert";

const people = [
  { name: "Anna", age: 34 },
  { name: "Kim", age: 42 },
  { name: "John", age: 23 },
];

const totalAge = sumOf(people, (person) => person.age);

assertEquals(totalAge, 99);
```
- Defined in collections/sum_of.ts:31