➕ Calculates the sum of all numbers in an array.
Syntax
TypeScript
import { sum } from '@opentf/std'; sum<T>( arr: T[] = [], cb?: (val: T, index: number) => number ): number
Parameters
arr: An array of numbers.cb: An optional iteratee invoked for each element to generate the value to be summed.
Returns
The sum of all elements. Returns 0 for empty arrays.
Examples
TypeScript
sum([]) //=> 0 sum([1]) //=> 1 sum([1, -1]) //=> 0 sum([-1, -2]) //=> -3 sum([1, 2, 3, 4, 5]) //=> 15 sum([1, 2, 3, 4, 5.4], Math.round) //=> 15 const objects = [{ n: 4 }, { n: 2 }, { n: 8 }]; sum(objects, (v) => v.n) //=> 14 sum(objects, (v, i) => v.n * i) //=> 18 ( (4*0) + (2*1) + (8*2) = 18 )