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            "title": "Allow One Function Call",
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            "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",
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                    "code": "/**\n * @param {Function} fn\n * @return {Function}\n */\nvar once = function(fn) {\n    \n\treturn function(...args){\n        \n    }\n};\n\n/**\n * let fn = (a,b,c) => (a + b + c)\n * let onceFn = once(fn)\n *\n * onceFn(1,2,3); // 6\n * onceFn(2,3,6); // returns undefined without calling fn\n */\n",
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                    "code": "type JSONValue = null | boolean | number | string | JSONValue[] | { [key: string]: JSONValue };\ntype OnceFn = (...args: JSONValue[]) => JSONValue | undefined\n\nfunction once(fn: Function): OnceFn {\n    \n\treturn function (...args) {\n\t\t\n\t};\n}\n\n/**\n * let fn = (a,b,c) => (a + b + c)\n * let onceFn = once(fn)\n *\n * onceFn(1,2,3); // 6\n * onceFn(2,3,6); // returns undefined without calling fn\n */",
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