leetcode-problemset/leetcode/originData/timeout-cancellation.json

{
    "data": {
        "question": {
            "questionId": "2821",
            "questionFrontendId": "2715",
            "boundTopicId": null,
            "title": "Timeout Cancellation",
            "titleSlug": "timeout-cancellation",
            "content": "<p>Given a function <code>fn</code>, an array of&nbsp;arguments&nbsp;<code>args</code>, and a timeout&nbsp;<code>t</code>&nbsp;in milliseconds, return a cancel function <code>cancelFn</code>.</p>\n\n<p>After a delay of <code>cancelTimeMs</code>, the returned cancel function <code>cancelFn</code> will be invoked.</p>\n\n<pre>\nsetTimeout(cancelFn, cancelTimeMs)\n</pre>\n\n<p>Initially, the execution of the function <code>fn</code> should be delayed by <code>t</code> milliseconds.</p>\n\n<p>If, before the delay of <code>t</code> milliseconds, the function <code>cancelFn</code> is invoked, it should cancel the delayed execution of <code>fn</code>. Otherwise, if <code>cancelFn</code> is not invoked within the specified delay <code>t</code>, <code>fn</code> should be executed with the provided <code>args</code> as arguments.</p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> fn = (x) =&gt; x * 5, args = [2], t = 20\n<strong>Output:</strong> [{&quot;time&quot;: 20, &quot;returned&quot;: 10}]\n<strong>Explanation:</strong> \nconst cancelTimeMs = 50;\nconst result = [];\n\nconst fn = (x) =&gt; x * 5;\n\nconst start = performance.now();\n\nconst log = (...argsArr) =&gt; {\n    const diff = Math.floor(performance.now() - start);\n    result.push({&quot;time&quot;: diff, &quot;returned&quot;: fn(...argsArr)});\n}\n &nbsp; &nbsp;&nbsp;\nconst cancel = cancellable(log, [2], 20);\n\nconst maxT = Math.max(t, 50);\n&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;\nsetTimeout(cancel, cancelTimeMs);\n\nsetTimeout(() =&gt; {\n &nbsp; &nbsp; console.log(result); // [{&quot;time&quot;:20,&quot;returned&quot;:10}]\n}, maxT + 15);\n\nThe cancellation was scheduled to occur after a delay of cancelTimeMs (50ms), which happened after the execution of fn(2) at 20ms.\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> fn = (x) =&gt; x**2, args = [2], t = 100\n<strong>Output:</strong> []\n<strong>Explanation:</strong> \nconst cancelTimeMs = 50;\nThe cancellation was scheduled to occur after a delay of cancelTimeMs (50ms), which happened before the execution of fn(2) at 100ms, resulting in fn(2) never being called.\n</pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> fn = (x1, x2) =&gt; x1 * x2, args = [2,4], t = 30\n<strong>Output:</strong> [{&quot;time&quot;: 30, &quot;returned&quot;: 8}]\n<strong>Explanation: \n</strong>const cancelTimeMs = 100;\nThe cancellation was scheduled to occur after a delay of cancelTimeMs (100ms), which happened after the execution of fn(2,4) at 30ms.\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>fn</code> is a function</li>\n\t<li><code>args</code> is a valid JSON array</li>\n\t<li><code>1 &lt;= args.length &lt;= 10</code></li>\n\t<li><code><font face=\"monospace\">20 &lt;= t &lt;= 1000</font></code></li>\n\t<li><code><font face=\"monospace\">10 &lt;= cancelTimeMs &lt;= 1000</font></code></li>\n</ul>\n",
            "translatedTitle": null,
            "translatedContent": null,
            "isPaidOnly": false,
            "difficulty": "Easy",
            "likes": 154,
            "dislikes": 173,
            "isLiked": null,
            "similarQuestions": "[]",
            "exampleTestcases": "(x) => x * 5\n[2]\n20\n50\n(x) => x**2\n[2]\n100\n50\n(x1, x2) => x1 * x2\n[2,4]\n30\n100",
            "categoryTitle": "JavaScript",
            "contributors": [],
            "topicTags": [],
            "companyTagStats": null,
            "codeSnippets": [
                {
                    "lang": "JavaScript",
                    "langSlug": "javascript",
                    "code": "/**\n * @param {Function} fn\n * @param {Array} args\n * @param {number} t\n * @return {Function}\n */\nvar cancellable = function(fn, args, t) {\n    \n};\n\n/**\n *  const result = [];\n *\n *  const fn = (x) => x * 5;\n *  const args = [2], t = 20, cancelTimeMs = 50;\n *\n *  const start = performance.now();\n *\n *  const log = (...argsArr) => {\n *      const diff = Math.floor(performance.now() - start);\n *      result.push({\"time\": diff, \"returned\": fn(...argsArr)});\n *  }\n *       \n *  const cancel = cancellable(log, args, t);\n *\n *  const maxT = Math.max(t, cancelTimeMs);\n *           \n *  setTimeout(cancel, cancelTimeMs);\n *\n *  setTimeout(() => {\n *     console.log(result); // [{\"time\":20,\"returned\":10}]\n *  }, maxT + 15)\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "TypeScript",
                    "langSlug": "typescript",
                    "code": "type JSONValue = null | boolean | number | string | JSONValue[] | { [key: string]: JSONValue };\ntype Fn = (...args: JSONValue[]) => void\n\nfunction cancellable(fn: Fn, args: JSONValue[], t: number): Function {\n\t\n};\n\n/**\n *  const result = [];\n *\n *  const fn = (x) => x * 5;\n *  const args = [2], t = 20, cancelTimeMs = 50;\n *\n *  const start = performance.now();\n *\n *  const log = (...argsArr) => {\n *      const diff = Math.floor(performance.now() - start);\n *      result.push({\"time\": diff, \"returned\": fn(...argsArr)});\n *  }\n *       \n *  const cancel = cancellable(log, args, t);\n *\n *  const maxT = Math.max(t, cancelTimeMs);\n *           \n *  setTimeout(cancel, cancelTimeMs);\n *\n *  setTimeout(() => {\n *     console.log(result); // [{\"time\":20,\"returned\":10}]\n *  }, maxT + 15)\n */",
                    "__typename": "CodeSnippetNode"
                }
            ],
            "stats": "{\"totalAccepted\": \"19.8K\", \"totalSubmission\": \"22.7K\", \"totalAcceptedRaw\": 19788, \"totalSubmissionRaw\": 22658, \"acRate\": \"87.3%\"}",
            "hints": [],
            "solution": {
                "id": "1974",
                "canSeeDetail": true,
                "paidOnly": false,
                "hasVideoSolution": false,
                "paidOnlyVideo": true,
                "__typename": "ArticleNode"
            },
            "status": null,
            "sampleTestCase": "(x) => x * 5\n[2]\n20\n50",
            "metaData": "{\n  \"name\": \"cancellable\",\n  \"params\": [\n    {\n      \"name\": \"fn\",\n      \"type\": \"string\"\n    },\n    {\n      \"type\": \"string\",\n      \"name\": \"args\"\n    },\n    {\n      \"type\": \"integer\",\n      \"name\": \"t\"\n    },\n    {\n      \"type\": \"integer\",\n      \"name\": \"cancelTimeMs\"\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,
            "enableTestMode": false,
            "enableDebugger": false,
            "envInfo": "{\"javascript\": [\"JavaScript\", \"<p><code>Node.js 16.13.2</code>.</p>\\r\\n\\r\\n<p>Your code is run with <code>--harmony</code> flag, enabling <a href=\\\"http://node.green/\\\" target=\\\"_blank\\\">new ES6 features</a>.</p>\\r\\n\\r\\n<p><a href=\\\"https://lodash.com\\\" target=\\\"_blank\\\">lodash.js</a> library is included by default.</p>\\r\\n\\r\\n<p>For Priority Queue / Queue data structures, you may use 5.3.0 version of <a href=\\\"https://github.com/datastructures-js/priority-queue/tree/fb4fdb984834421279aeb081df7af624d17c2a03\\\" target=\\\"_blank\\\">datastructures-js/priority-queue</a> and 4.2.1 version of <a href=\\\"https://github.com/datastructures-js/queue/tree/e63563025a5a805aa16928cb53bcd517bfea9230\\\" target=\\\"_blank\\\">datastructures-js/queue</a>.</p>\"], \"typescript\": [\"Typescript\", \"<p><code>TypeScript 5.1.6, Node.js 16.13.2</code>.</p>\\r\\n\\r\\n<p>Your code is run with <code>--harmony</code> flag, enabling <a href=\\\"http://node.green/\\\" target=\\\"_blank\\\">new ES2022 features</a>.</p>\\r\\n\\r\\n<p><a href=\\\"https://lodash.com\\\" target=\\\"_blank\\\">lodash.js</a> library is included by default.</p>\"]}",
            "libraryUrl": null,
            "adminUrl": null,
            "challengeQuestion": null,
            "__typename": "QuestionNode"
        }
    }
}