ts_temp/array/head.js

/**
 * Returns the first element of the given array.
 *
 * @param {Array} arr
 * @return {*}
 * @example
 *
 *      head(['fi', 'fo', 'fum']); //=> 'fi'
 *      head([]); //=> undefined
 */
export default ((arr) => arr && arr[0]);