everyutil/number/digitalRoot.d.ts

A comprehensive library of lightweight, reusable utility functions for JavaScript and TypeScript, designed to streamline common programming tasks such as string manipulation, array processing, date handling, and more.

/**
 * Calculates the digital root of a number (sum of digits until a single digit).
 * For example, digitalRoot(942) returns 6.
 * @author @dailker
 * @param {number} n - The number to process.
 * @returns {number} The digital root.
 */
export declare function digitalRoot(n: number): number;