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/** * lodash 3.9.1 (Custom Build) <https://lodash.com/> * Build: `lodash modern modularize exports="npm" -o ./` * Copyright 2012-2015 The Dojo Foundation <http://dojofoundation.org/> * Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE> * Copyright 2009-2015 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors * Available under MIT license <https://lodash.com/license> */ /** `Object#toString` result references. */ var funcTag = '[object Function]'; /** Used to detect host constructors (Safari > 5). */ var reIsHostCtor = /^\[object .+?Constructor\]$/; /** * Checks if `value` is object-like. * * @private * @param {*} value The value to check. * @returns {boolean} Returns `true` if `value` is object-like, else `false`. */ function isObjectLike(value) { return !!value && typeof value == 'object'; } /** Used for native method references. */ var objectProto = Object.prototype; /** Used to resolve the decompiled source of functions. */ var fnToString = Function.prototype.toString; /** Used to check objects for own properties. */ var hasOwnProperty = objectProto.hasOwnProperty; /** * Used to resolve the [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring) * of values. */ var objToString = objectProto.toString; /** Used to detect if a method is native. */ var reIsNative = RegExp('^' + fnToString.call(hasOwnProperty).replace(/[\\^$.*+?()[\]{}|]/g, '\\$&') .replace(/hasOwnProperty|(function).*?(?=\\\()| for .+?(?=\\\])/g, '$1.*?') + '$' ); /** * Gets the native function at `key` of `object`. * * @private * @param {Object} object The object to query. * @param {string} key The key of the method to get. * @returns {*} Returns the function if it's native, else `undefined`. */ function getNative(object, key) { var value = object == null ? undefined : object[key]; return isNative(value) ? value : undefined; } /** * 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 equivalents which return 'object' for typed array constructors. return isObject(value) && objToString.call(value) == funcTag; } /** * Checks if `value` is the [language type](https://es5.github.io/#x8) of `Object`. * (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`) * * @static * @memberOf _ * @category Lang * @param {*} value The value to check. * @returns {boolean} Returns `true` if `value` is an object, else `false`. * @example * * _.isObject({}); * // => true * * _.isObject([1, 2, 3]); * // => true * * _.isObject(1); * // => false */ function isObject(value) { // Avoid a V8 JIT bug in Chrome 19-20. // See https://code.google.com/p/v8/issues/detail?id=2291 for more details. var type = typeof value; return !!value && (type == 'object' || type == 'function'); } /** * 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 = getNative;
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