| var isObject = require('./isObject'); |
| |
| /** `Object#toString` result references. */ |
| var funcTag = '[object Function]'; |
| |
| /** Used for native method references. */ |
| var objectProto = Object.prototype; |
| |
| /** |
| * Used to resolve the [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring) |
| * of values. |
| */ |
| var objToString = objectProto.toString; |
| |
| /** |
| * Checks if `value` is classified as a `Function` object. |
| * |
| * @static |
| * @memberOf _ |
| * @category Lang |
| * @param {*} value The value to check. |
| * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`. |
| * @example |
| * |
| * _.isFunction(_); |
| * // => true |
| * |
| * _.isFunction(/abc/); |
| * // => false |
| */ |
| function isFunction(value) { |
| // The use of `Object#toString` avoids issues with the `typeof` operator |
| // in older versions of Chrome and Safari which return 'function' for regexes |
| // and Safari 8 which returns 'object' for typed array constructors. |
| return isObject(value) && objToString.call(value) == funcTag; |
| } |
| |
| module.exports = isFunction; |
