leetcode-problemset/leetcode-cn/originData/promise-time-limit.json

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        "question": {
            "questionId": "2749",
            "questionFrontendId": "2637",
            "categoryTitle": "JavaScript",
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            "title": "Promise Time Limit",
            "titleSlug": "promise-time-limit",
            "content": "<p>Given an&nbsp;asynchronous function&nbsp;<code>fn</code>&nbsp;and a time <code>t</code>&nbsp;in milliseconds, return&nbsp;a new&nbsp;<strong>time limited</strong>&nbsp;version of the input function. <code>fn</code> takes arguments provided to the&nbsp;<strong>time limited&nbsp;</strong>function.</p>\n\n<p>The <strong>time limited</strong> function should follow these rules:</p>\n\n<ul>\n\t<li>If the <code>fn</code> completes within the time limit of <code>t</code> milliseconds, the <strong>time limited</strong> function should&nbsp;resolve with the result.</li>\n\t<li>If the execution of the <code>fn</code> exceeds the time limit, the <strong>time limited</strong> function should reject with the string <code>&quot;Time Limit Exceeded&quot;</code>.</li>\n</ul>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> \nfn = async (n) =&gt; { \n&nbsp; await new Promise(res =&gt; setTimeout(res, 100)); \n&nbsp; return n * n; \n}\ninputs = [5]\nt = 50\n<strong>Output:</strong> {&quot;rejected&quot;:&quot;Time Limit Exceeded&quot;,&quot;time&quot;:50}\n<strong>Explanation:</strong>\nconst limited = timeLimit(fn, t)\nconst start = performance.now()\nlet result;\ntry {\n&nbsp; &nbsp;const res = await limited(...inputs)\n&nbsp; &nbsp;result = {&quot;resolved&quot;: res, &quot;time&quot;: Math.floor(performance.now() - start)};\n} catch (err) {\n&nbsp;  result = {&quot;rejected&quot;: err, &quot;time&quot;: Math.floor(performance.now() - start)};\n}\nconsole.log(result) // Output\n\nThe provided function is set to resolve after 100ms. However, the time limit is set to 50ms. It rejects at t=50ms because the time limit was reached.\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> \nfn = async (n) =&gt; { \n&nbsp; await new Promise(res =&gt; setTimeout(res, 100)); \n&nbsp; return n * n; \n}\ninputs = [5]\nt = 150\n<strong>Output:</strong> {&quot;resolved&quot;:25,&quot;time&quot;:100}\n<strong>Explanation:</strong>\nThe function resolved 5 * 5 = 25 at t=100ms. The time limit is never reached.\n</pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> \nfn = async (a, b) =&gt; { \n&nbsp; await new Promise(res =&gt; setTimeout(res, 120)); \n&nbsp; return a + b; \n}\ninputs = [5,10]\nt = 150\n<strong>Output:</strong> {&quot;resolved&quot;:15,&quot;time&quot;:120}\n<strong>Explanation:</strong>\n​​​​The function resolved 5 + 10 = 15 at t=120ms. The time limit is never reached.\n</pre>\n\n<p><strong class=\"example\">Example 4:</strong></p>\n\n<pre>\n<strong>Input:</strong> \nfn = async () =&gt; { \n&nbsp; throw &quot;Error&quot;;\n}\ninputs = []\nt = 1000\n<strong>Output:</strong> {&quot;rejected&quot;:&quot;Error&quot;,&quot;time&quot;:0}\n<strong>Explanation:</strong>\nThe function immediately throws an error.</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>0 &lt;= inputs.length &lt;= 10</code></li>\n\t<li><code>0 &lt;= t &lt;= 1000</code></li>\n\t<li><code>fn</code> returns a promise</li>\n</ul>\n",
            "translatedTitle": "有时间限制的 Promise 对象",
            "translatedContent": "<p>请你编写一个函数，它接受一个异步函数 <code>fn</code>&nbsp;和一个以毫秒为单位的时间 <code>t</code>。它应根据限时函数返回一个有 <strong>限时</strong> 效果的函数。函数 <code>fn</code> 接受提供给 <strong>限时</strong> 函数的参数。</p>\n\n<p><strong>限时</strong> 函数应遵循以下规则：</p>\n\n<ul>\n\t<li>如果 <code>fn</code> 在 <code>t</code> 毫秒的时间限制内完成，<strong>限时</strong> 函数应返回结果。</li>\n\t<li>如果 <code>fn</code> 的执行超过时间限制，<strong>限时&nbsp;</strong>函数应拒绝并返回字符串 <code>\"Time Limit Exceeded\"</code> 。</li>\n</ul>\n\n<p>&nbsp;</p>\n\n<p><b>示例 1：</b></p>\n\n<pre>\n<strong>输入：</strong>\nfn = async (n) =&gt; { \n&nbsp; await new Promise(res =&gt; setTimeout(res, 100)); \n&nbsp; return n * n; \n}\ninputs = [5]\nt = 50\n<strong>输出：</strong>{\"rejected\":\"Time Limit Exceeded\",\"time\":50}\n<strong>解释：</strong>\nconst limited = timeLimit(fn, t)\nconst start = performance.now()\nlet result;\ntry {\n&nbsp; &nbsp;const res = await limited(...inputs)\n&nbsp; &nbsp;result = {\"resolved\": res, \"time\": Math.floor(performance.now() - start)};\n} catch (err) {\n&nbsp;  result = {\"rejected\": err, \"time\": Math.floor(performance.now() - start)};\n}\nconsole.log(result) // 输出结果\n<b>\n</b>提供的函数设置在 100ms 后执行完成，但是设置的超时时间为 50ms，所以在 t=50ms 时拒绝因为达到了超时时间。\n</pre>\n\n<p><b>示例 2：</b></p>\n\n<pre>\n<strong>输入：</strong>\nfn = async (n) =&gt; { \n&nbsp; await new Promise(res =&gt; setTimeout(res, 100)); \n&nbsp; return n * n; \n}\ninputs = [5]\nt = 150\n<strong>输出：</strong>{\"resolved\":25,\"time\":100}\n<strong>解释：</strong>\n在 t=100ms 时执行 5*5=25 ，没有达到超时时间。\n</pre>\n\n<p><b>示例 3：</b></p>\n\n<pre>\n<strong>输入：</strong>\nfn = async (a, b) =&gt; { \n&nbsp; await new Promise(res =&gt; setTimeout(res, 120)); \n&nbsp; return a + b; \n}\ninputs = [5,10]\nt = 150\n<strong>输出：</strong>{\"resolved\":15,\"time\":120}\n<strong>解释：</strong><b>\n</b>在 t=120ms 时执行 5+10=15，没有达到超时时间。\n</pre>\n\n<p><b>示例 4：</b></p>\n\n<pre>\n<strong>输入：</strong>\nfn = async () =&gt; { \n&nbsp; throw \"Error\";\n}\ninputs = []\nt = 1000\n<strong>输出：</strong>{\"rejected\":\"Error\",\"time\":0}\n<strong>解释：</strong>\n此函数始终丢出 Error</pre>\n\n<p>&nbsp;</p>\n\n<p><b>提示：</b></p>\n\n<ul>\n\t<li><code>0 &lt;= inputs.length &lt;= 10</code></li>\n\t<li><code>0 &lt;= t &lt;= 1000</code></li>\n\t<li><code>fn</code> 返回一个 Promise 对象</li>\n</ul>\n",
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                    "code": "/**\n * @param {Function} fn\n * @param {number} t\n * @return {Function}\n */\nvar timeLimit = function(fn, t) {\n    \n\treturn async function(...args) {\n        \n    }\n};\n\n/**\n * const limited = timeLimit((t) => new Promise(res => setTimeout(res, t)), 100);\n * limited(150).catch(console.log) // \"Time Limit Exceeded\" at t=100ms\n */",
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                    "code": "type Fn = (...params: any[]) => Promise<any>;\n\nfunction timeLimit(fn: Fn, t: number): Fn {\n    \n\treturn async function(...args) {\n        \n    }\n};\n\n/**\n * const limited = timeLimit((t) => new Promise(res => setTimeout(res, t)), 100);\n * limited(150).catch(console.log) // \"Time Limit Exceeded\" at t=100ms\n */",
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                "You can return a copy of a function with: \r\n\r\nfunction outerFunction(fn) { \r\n  return function innerFunction(...params) {\r\n    return fn(...params);\r\n  };\r\n}",
                "Inside the inner function, you will need to return a new Promise.",
                "You can create a new promise like: new Promise((resolve, reject) => {}).",
                "You can execute code with a delay with \"setTimeout(fn, delay)\"",
                "To reject a promise after a delay, \"setTimeout(() => reject('err'), delay)\"",
                "You can resolve and reject when the passed promise resolves or rejects with: \"fn(...params).then(resolve).catch(reject)\""
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