/**
 * Adds together all the elements of a list.
 *
 * @param {Array} arr An array of numbers
 * @return {Number} The sum of all the numbers in the list.
 * @example
 *
 *      sum([2,4,6,8,100,1]); //=> 121
 */
declare const _default: (arr?: ArrayLike<number>) => number;
export default _default;