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.
\n\nThere are no constraints on the data types that can be passed to the function. For example, the value or the class could be undefined.
\n
Example 1:
\n\n\nInput: func = () => checkIfInstanceOf(new Date(), Date)\nOutput: true\nExplanation: The object returned by the Date constructor is, by definition, an instance of Date.\n\n\n
Example 2:
\n\n\nInput: func = () => { class Animal {}; class Dog extends Animal {}; return checkIfInstanceOf(new Dog(), Animal); }\nOutput: true\nExplanation:\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.\n\nExample 3:
\n\n\nInput: func = () => checkIfInstanceOf(Date, Date)\nOutput: false\nExplanation: A date constructor cannot logically be an instance of itself.\n\n\n
Example 4:
\n\n\nInput: func = () => checkIfInstanceOf(5, Number)\nOutput: true\nExplanation: 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\n", "translatedTitle": "检查是否是类的对象实例", "translatedContent": "
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。
\n\n可以传递给函数的数据类型没有限制。例如，值或类可能是 undefined 。
\n\n
示例 1：
\n\n\n输入：func = () => checkIfInstance(new Date(), Date)\n输出：true\n解释：根据定义，Date 构造函数返回的对象是 Date 的一个实例。\n\n\n
示例 2：
\n\n\n输入：func = () => { class Animal {}; class Dog extends Animal {}; return checkIfInstance(new Dog(), Animal); }\n输出：true\n解释：\nclass Animal {};\nclass Dog extends Animal {};\ncheckIfInstanceOf(new Dog(), Animal); // true\n\nDog 是 Animal 的子类。因此，Dog 对象同时是 Dog 和 Animal 的实例。\n\n示例 3：
\n\n\n输入：func = () => checkIfInstance(Date, Date)\n输出：false\n解释：日期的构造函数在逻辑上不能是其自身的实例。\n\n\n
示例 4：
\n\n\n输入：func = () => checkIfInstance(5, Number)\n输出：true\n解释：5 是一个 Number。注意，\"instanceof\" 关键字将返回 false。\n", "isPaidOnly": false, "difficulty": "Medium", "likes": 21, "dislikes": 0, "isLiked": null, "similarQuestions": "[]", "contributors": [], "langToValidPlayground": "{\"cpp\": true, \"java\": true, \"python\": true, \"python3\": true, \"mysql\": false, \"mssql\": false, \"oraclesql\": false, \"c\": false, \"csharp\": false, \"javascript\": false, \"typescript\": false, \"bash\": false, \"php\": false, \"swift\": false, \"kotlin\": false, \"dart\": false, \"golang\": false, \"ruby\": false, \"scala\": false, \"html\": false, \"pythonml\": false, \"rust\": false, \"racket\": false, \"erlang\": false, \"elixir\": false, \"pythondata\": false, \"react\": false, \"vanillajs\": false, \"postgresql\": false}", "topicTags": [], "companyTagStats": null, "codeSnippets": [ { "lang": "JavaScript", "langSlug": "javascript", "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 */", "__typename": "CodeSnippetNode" }, { "lang": "TypeScript", "langSlug": "typescript", "code": "function checkIfInstanceOf(obj: any, classFunction: any): boolean {\n\n};\n\n/**\n * checkIfInstanceOf(new Date(), Date); // true\n */", "__typename": "CodeSnippetNode" } ], "stats": "{\"totalAccepted\": \"5.4K\", \"totalSubmission\": \"15.7K\", \"totalAcceptedRaw\": 5356, \"totalSubmissionRaw\": 15709, \"acRate\": \"34.1%\"}", "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." ], "solution": null, "status": null, "sampleTestCase": "() => checkIfInstanceOf(new Date(), Date)", "metaData": "{\n \"name\": \"checkIfInstance\",\n \"params\": [\n {\n \"name\": \"func\",\n \"type\": \"string\"\n }\n ],\n \"return\": {\n \"type\": \"integer\"\n },\n \"languages\": [\n \"javascript\",\n \"typescript\"\n ],\n \"manual\": true\n}", "judgerAvailable": true, "judgeType": "large", "mysqlSchemas": [], "enableRunCode": true, "envInfo": "{\"javascript\":[\"JavaScript\",\"
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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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