ary.js (857B)
1 var createWrap = require('./_createWrap'); 2 3 /** Used to compose bitmasks for function metadata. */ 4 var WRAP_ARY_FLAG = 128; 5 6 /** 7 * Creates a function that invokes `func`, with up to `n` arguments, 8 * ignoring any additional arguments. 9 * 10 * @static 11 * @memberOf _ 12 * @since 3.0.0 13 * @category Function 14 * @param {Function} func The function to cap arguments for. 15 * @param {number} [n=func.length] The arity cap. 16 * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`. 17 * @returns {Function} Returns the new capped function. 18 * @example 19 * 20 * _.map(['6', '8', '10'], _.ary(parseInt, 1)); 21 * // => [6, 8, 10] 22 */ 23 function ary(func, n, guard) { 24 n = guard ? undefined : n; 25 n = (func && n == null) ? func.length : n; 26 return createWrap(func, WRAP_ARY_FLAG, undefined, undefined, undefined, undefined, n); 27 } 28 29 module.exports = ary;