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            "categoryTitle": "JavaScript",
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            "title": "Allow One Function Call",
            "titleSlug": "allow-one-function-call",
            "content": "<p>Given a function <code>fn</code>, return a new function that is identical to the original function except that it ensures&nbsp;<code>fn</code>&nbsp;is&nbsp;called at most once.</p>\n\n<ul>\n\t<li>The first time the returned function is called, it should return the same result as&nbsp;<code>fn</code>.</li>\n\t<li>Every subsequent time it is called, it should return&nbsp;<code>undefined</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> fn = (a,b,c) =&gt; (a + b + c), calls = [[1,2,3],[2,3,6]]\n<strong>Output:</strong> [{&quot;calls&quot;:1,&quot;value&quot;:6}]\n<strong>Explanation:</strong>\nconst onceFn = once(fn);\nonceFn(1, 2, 3); // 6\nonceFn(2, 3, 6); // undefined, fn was not called\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> fn = (a,b,c) =&gt; (a * b * c), calls = [[5,7,4],[2,3,6],[4,6,8]]\n<strong>Output:</strong> [{&quot;calls&quot;:1,&quot;value&quot;:140}]\n<strong>Explanation:</strong>\nconst onceFn = once(fn);\nonceFn(5, 7, 4); // 140\nonceFn(2, 3, 6); // undefined, fn was not called\nonceFn(4, 6, 8); // undefined, fn was not called\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>calls</code> is a valid JSON array</li>\n\t<li><code>1 &lt;= calls.length &lt;= 10</code></li>\n\t<li><code>1 &lt;= calls[i].length &lt;= 100</code></li>\n\t<li><code>2 &lt;= JSON.stringify(calls).length &lt;= 1000</code></li>\n</ul>\n",
            "translatedTitle": "只允许一次函数调用",
            "translatedContent": "<p>给定一个函数 <code>fn</code> ，它返回一个新的函数，返回的函数与原始函数完全相同，只不过它确保 <code>fn</code> 最多被调用一次。</p>\n\n<ul>\n\t<li>第一次调用返回的函数时，它应该返回与 <code>fn</code> 相同的结果。</li>\n\t<li>第一次后的每次调用，它应该返回 <code>undefined</code> 。</li>\n</ul>\n\n<p>&nbsp;</p>\n\n<p><b>示例 1：</b></p>\n\n<pre>\n<b>输入：</b>fn = (a,b,c) =&gt; (a + b + c), calls = [[1,2,3],[2,3,6]]\n<b>输出：</b>[{\"calls\":1,\"value\":6}]\n<strong>解释：</strong>\nconst onceFn = once(fn);\nonceFn(1, 2, 3); // 6\nonceFn(2, 3, 6); // undefined, fn 没有被调用\n</pre>\n\n<p><strong class=\"example\">示例 2：</strong></p>\n\n<pre>\n<b>输入：</b>fn = (a,b,c) =&gt; (a * b * c), calls = [[5,7,4],[2,3,6],[4,6,8]]\n<b>输出：</b>[{\"calls\":1,\"value\":140}]\n<strong>解释：</strong>\nconst onceFn = once(fn);\nonceFn(5, 7, 4); // 140\nonceFn(2, 3, 6); // undefined, fn 没有被调用\nonceFn(4, 6, 8); // undefined, fn 没有被调用\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>calls</code> 是一个有效的 JSON 数组</li>\n\t<li><code>1 &lt;= calls.length &lt;= 10</code></li>\n\t<li><code>1 &lt;= calls[i].length &lt;= 100</code></li>\n\t<li><code>2 &lt;= JSON.stringify(calls).length &lt;= 1000</code></li>\n</ul>\n",
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