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"title" : "Check if Object Instance of Class" ,
"titleSlug" : "check-if-object-instance-of-class" ,
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"content" : "<p>Write a function that checks if a given value is an instance of a given class or superclass. For this problem, an object is considered an instance of a given class if that object has access to that class's methods.</p>\n\n<p>There are no constraints on the data types that can be passed to the function. For example, the value or the class could be <code>undefined</code>.</p>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> func = () => checkIfInstanceOf(new Date(), Date)\n<strong>Output:</strong> true\n<strong>Explanation: </strong>The object returned by the Date constructor is, by definition, an instance of Date.\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> func = () => { class Animal {}; class Dog extends Animal {}; return checkIfInstanceOf(new Dog(), Animal); }\n<strong>Output:</strong> true\n<strong>Explanation:</strong>\nclass Animal {};\nclass Dog extends Animal {};\ncheckIfInstanceOf(new Dog(), Animal); // true\n\nDog is a subclass of Animal. Therefore, a Dog object is an instance of both Dog and Animal.</pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> func = () => checkIfInstanceOf(Date, Date)\n<strong>Output:</strong> false\n<strong>Explanation: </strong>A date constructor cannot logically be an instance of itself.\n</pre>\n\n<p><strong class=\"example\">Example 4:</strong></p>\n\n<pre>\n<strong>Input:</strong> func = () => checkIfInstanceOf(5, Number)\n<strong>Output:</strong> true\n<strong>Explanation: </strong>5 is a Number. Note that the "instanceof" keyword would return false. However, it is still considered an instance of Number because it accesses the Number methods. For example "toFixed()".\n</pre>\n" ,
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"translatedTitle" : "检查是否是类的对象实例" ,
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"translatedContent" : "<p>请你编写一个函数，检查给定的值是否是给定类或超类的实例。</p>\n\n<p>可以传递给函数的数据类型没有限制。例如，值或类可能是 <code>undefined</code> 。</p>\n\n<p> </p>\n\n<p><strong>示例 1： ， ： ， ： ： ， ,
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"lang" : "JavaScript" ,
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"code" : "/**\n * @param {*} obj\n * @param {*} classFunction\n * @return {boolean}\n */\nvar checkIfInstanceOf = function(obj, classFunction) {\n \n};\n\n/**\n * checkIfInstanceOf(new Date(), Date); // true\n */" ,
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"code" : "function checkIfInstanceOf(obj: any, classFunction: any): boolean {\n\n};\n\n/**\n * checkIfInstanceOf(new Date(), Date); // true\n */" ,
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"hints" : [
"In Javascript, inheritance is achieved with the prototype chain." ,
"You can get the prototype of an object with the Object.getPrototypeOf(obj) function. Alternatively, you can code obj['__proto__']." ,
"You can compare an object's __proto__ with classFunction.prototype." ,
"Traverse the entire prototype chain until you find a match."
] ,
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"sampleTestCase" : "() => checkIfInstanceOf(new Date(), Date)" ,
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"exampleTestcases" : "() => checkIfInstanceOf(new Date(), Date)\n() => { class Animal {}; class Dog extends Animal {}; return checkIfInstanceOf(new Dog(), Animal); }\n() => checkIfInstanceOf(Date, Date)\n() => checkIfInstanceOf(5, Number)" ,
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