leetcode-problemset/leetcode-cn/originData/check-if-object-instance-of-class.json

{
    "data": {
        "question": {
            "questionId": "2758",
            "questionFrontendId": "2618",
            "categoryTitle": "JavaScript",
            "boundTopicId": 2221875,
            "title": "Check if Object Instance of Class",
            "titleSlug": "check-if-object-instance-of-class",
            "content": "<p>Write a function that checks if a given value&nbsp;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&#39;s methods.</p>\n\n<p>There are&nbsp;no constraints on the data types that can be passed to the function. For example, the value or the class could be&nbsp;<code>undefined</code>.</p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> func = () =&gt; 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 = () =&gt; { 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 = () =&gt; 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 = () =&gt; checkIfInstanceOf(5, Number)\n<strong>Output:</strong> true\n<strong>Explanation: </strong>5 is a Number. Note that the &quot;instanceof&quot; keyword would return false. However, it is still considered an instance of Number because it accesses the Number methods. For example &quot;toFixed()&quot;.\n</pre>\n",
            "translatedTitle": "检查是否是类的对象实例",
            "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&nbsp; <code>undefined</code> 。</p>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre>\n<b>输入：</b>func = () =&gt; checkIfInstance(new Date(), Date)\n<b>输出：</b>true\n<strong>解释：</strong>根据定义，Date 构造函数返回的对象是 Date 的一个实例。\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre>\n<b>输入：</b>func = () =&gt; { class Animal {}; class Dog extends Animal {}; return checkIfInstance(new Dog(), Animal); }\n<b>输出：</b>true\n<strong>解释：</strong>\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。</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<pre>\n<b>输入：</b>func = () =&gt; checkIfInstance(Date, Date)\n<b>输出：</b>false\n<strong>解释：</strong>日期的构造函数在逻辑上不能是其自身的实例。\n</pre>\n\n<p><strong>示例 4：</strong></p>\n\n<pre>\n<b>输入：</b>func = () =&gt; checkIfInstance(5, Number)\n<b>输出：</b>true\n<strong>解释：</strong>5 是一个 Number。注意，\"instanceof\" 关键字将返回 false。</pre>\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\",\"<p>\\u7248\\u672c\\uff1a<code>Node.js 16.13.2<\\/code><\\/p>\\r\\n\\r\\n<p>\\u60a8\\u7684\\u4ee3\\u7801\\u5728\\u6267\\u884c\\u65f6\\u5c06\\u5e26\\u4e0a <code>--harmony<\\/code> \\u6807\\u8bb0\\u6765\\u5f00\\u542f <a href=\\\"http:\\/\\/node.green\\/\\\" target=\\\"_blank\\\">\\u65b0\\u7248ES6\\u7279\\u6027<\\/a>\\u3002<\\/p>\\r\\n\\r\\n<p><a href=\\\"https:\\/\\/lodash.com\\\" target=\\\"_blank\\\">lodash.js<\\/a> \\u5e93\\u5df2\\u7ecf\\u9ed8\\u8ba4\\u88ab\\u5305\\u542b\\u3002<\\/p>\\r\\n\\r\\n<p> \\u5982\\u9700\\u4f7f\\u7528\\u961f\\u5217\\/\\u4f18\\u5148\\u961f\\u5217\\uff0c\\u60a8\\u53ef\\u4f7f\\u7528 <a href=\\\"https:\\/\\/github.com\\/datastructures-js\\/priority-queue\\/tree\\/fb4fdb984834421279aeb081df7af624d17c2a03\\\" target=\\\"_blank\\\"> datastructures-js\\/priority-queue@5.3.0<\\/a> \\u548c <a href=\\\"https:\\/\\/github.com\\/datastructures-js\\/queue\\/tree\\/e63563025a5a805aa16928cb53bcd517bfea9230\\\" target=\\\"_blank\\\"> datastructures-js\\/queue@4.2.1<\\/a>\\u3002<\\/p>\"],\"typescript\":[\"TypeScript\",\"<p>TypeScript 5.1.6<\\/p>\\r\\n\\r\\n<p>Compile Options: --alwaysStrict --strictBindCallApply --strictFunctionTypes --target ES2022<\\/p>\\r\\n\\r\\n<p><a href=\\\"https:\\/\\/lodash.com\\\" target=\\\"_blank\\\">lodash.js<\\/a> \\u5e93\\u5df2\\u7ecf\\u9ed8\\u8ba4\\u88ab\\u5305\\u542b\\u3002<\\/p>\\r\\n\\r\\n<p> \\u5982\\u9700\\u4f7f\\u7528\\u961f\\u5217\\/\\u4f18\\u5148\\u961f\\u5217\\uff0c\\u60a8\\u53ef\\u4f7f\\u7528 <a href=\\\"https:\\/\\/github.com\\/datastructures-js\\/priority-queue\\/tree\\/fb4fdb984834421279aeb081df7af624d17c2a03\\\" target=\\\"_blank\\\"> datastructures-js\\/priority-queue@5.3.0<\\/a> \\u548c <a href=\\\"https:\\/\\/github.com\\/datastructures-js\\/queue\\/tree\\/e63563025a5a805aa16928cb53bcd517bfea9230\\\" target=\\\"_blank\\\"> datastructures-js\\/queue@4.2.1<\\/a>\\u3002<\\/p>\"]}",
            "book": null,
            "isSubscribed": false,
            "isDailyQuestion": false,
            "dailyRecordStatus": null,
            "editorType": "CKEDITOR",
            "ugcQuestionId": null,
            "style": "LEETCODE",
            "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)",
            "__typename": "QuestionNode"
        }
    }
}