var ary = require('./ary');

/**
 * Creates a function that accepts up to one argument, ignoring any
 * additional arguments.
 *
 * @static
 * @memberOf _
 * @category Function
 * @param {Function} func The function to cap arguments for.
 * @returns {Function} Returns the new function.
 * @example
 *
 * _.map(['6', '8', '10'], _.unary(parseInt));
 * // => [6, 8, 10]
 */
function unary(func) {
  return ary(func, 1);
}

module.exports = unary;
