Sums a numeric property across an array of objects in a type-safe manner.

Only accepts properties that are of type number, enforced at the type level via the OnlyNumerics mapped type. Handles null and undefined arrays gracefully by treating them as empty.

Example

const orders = [{ total: 10 }, { total: 25 }, { total: 5 }];
summate(orders, 'total'); // => 40

function summate<T extends OnlyNumerics<T>>(items: T[] | undefined | null, prop: keyof OnlyNumerics<T>): number

Parameters

items

prop