| var isFunction = require('./isFunction'), |
| isObjectLike = require('../internal/isObjectLike'); |
| |
| /** Used to detect host constructors (Safari > 5). */ |
| var reIsHostCtor = /^\[object .+?Constructor\]$/; |
| |
| /** Used for native method references. */ |
| var objectProto = Object.prototype; |
| |
| /** Used to resolve the decompiled source of functions. */ |
| var fnToString = Function.prototype.toString; |
| |
| /** Used to check objects for own properties. */ |
| var hasOwnProperty = objectProto.hasOwnProperty; |
| |
| /** Used to detect if a method is native. */ |
| var reIsNative = RegExp('^' + |
| fnToString.call(hasOwnProperty).replace(/[\\^$.*+?()[\]{}|]/g, '\\$&') |
| .replace(/hasOwnProperty|(function).*?(?=\\\()| for .+?(?=\\\])/g, '$1.*?') + '$' |
| ); |
| |
| /** |
| * Checks if `value` is a native function. |
| * |
| * @static |
| * @memberOf _ |
| * @category Lang |
| * @param {*} value The value to check. |
| * @returns {boolean} Returns `true` if `value` is a native function, else `false`. |
| * @example |
| * |
| * _.isNative(Array.prototype.push); |
| * // => true |
| * |
| * _.isNative(_); |
| * // => false |
| */ |
| function isNative(value) { |
| if (value == null) { |
| return false; |
| } |
| if (isFunction(value)) { |
| return reIsNative.test(fnToString.call(value)); |
| } |
| return isObjectLike(value) && reIsHostCtor.test(value); |
| } |
| |
| module.exports = isNative; |