import { prod } from '@opentf/std';
 
prod(
  arr: number[] = [],
  cb?: (val: number, index: number) => number
): number

prod() //=> 1
 
prod([]) //=> 1
 
prod([1]) //=> 1
 
prod([1, -1]) //=> -1
 
prod([-1, -2]) //=> 2
 
prod([1, 2, 3, 4, 5]) //=> 120
 
const objects = [{ n: 4 }, { n: 2 }, { n: 8 }, { n: 6 }];
prod(objects, (v) => v.n) //=> 384