| var createWrapper = require('../internal/createWrapper'), |
| isIterateeCall = require('../internal/isIterateeCall'); |
| |
| /** Used to compose bitmasks for wrapper metadata. */ |
| var ARY_FLAG = 128; |
| |
| /* Native method references for those with the same name as other `lodash` methods. */ |
| var nativeMax = Math.max; |
| |
| /** |
| * Creates a function that accepts up to `n` arguments ignoring any |
| * additional arguments. |
| * |
| * @static |
| * @memberOf _ |
| * @category Function |
| * @param {Function} func The function to cap arguments for. |
| * @param {number} [n=func.length] The arity cap. |
| * @param- {Object} [guard] Enables use as a callback for functions like `_.map`. |
| * @returns {Function} Returns the new function. |
| * @example |
| * |
| * _.map(['6', '8', '10'], _.ary(parseInt, 1)); |
| * // => [6, 8, 10] |
| */ |
| function ary(func, n, guard) { |
| if (guard && isIterateeCall(func, n, guard)) { |
| n = undefined; |
| } |
| n = (func && n == null) ? func.length : nativeMax(+n || 0, 0); |
| return createWrapper(func, ARY_FLAG, undefined, undefined, undefined, undefined, n); |
| } |
| |
| module.exports = ary; |