➕ Calculates the sum of all numbers in an array.
Syntax
import { sum } from '@opentf/std';
sum<T>(
arr: T[] = [],
cb?: (val: T, index: number) => number
): numberParameters
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
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 )