mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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59 lines
10 KiB
JSON
59 lines
10 KiB
JSON
{
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"questionId": "2790",
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"questionFrontendId": "2693",
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"categoryTitle": "JavaScript",
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"boundTopicId": 2275502,
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"title": "Call Function with Custom Context",
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"titleSlug": "call-function-with-custom-context",
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"content": "<p>Enhance all functions to have the <code>callPolyfill</code> method. The method accepts an object <code>obj</code> as it's first parameter and any number of additional arguments. The <code>obj</code> becomes the <code>this</code> context for the function. The additional arguments are passed to the function (that the <code>callPolyfill</code> method belongs on).</p>\n\n<p>For example if you had the function:</p>\n\n<pre>\nfunction tax(price, taxRate) {\n const totalCost = price * (1 + taxRate);\n console.log(`The cost of ${this.item} is ${totalCost}`);\n}\n</pre>\n\n<p>Calling this function like <code>tax(10, 0.1)</code> will log <code>"The cost of undefined is 11"</code>. This is because the <code>this</code> context was not defined.</p>\n\n<p>However, calling the function like <code>tax.callPolyfill({item: "salad"}, 10, 0.1)</code> will log <code>"The cost of salad is 11"</code>. The <code>this</code> context was appropriately set, and the function logged an appropriate output.</p>\n\n<p>Please solve this without using the built-in <code>Function.call</code> method.</p>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong>\nfn = function add(b) {\n return this.a + b;\n}\nargs = [{"a": 5}, 7]\n<strong>Output:</strong> 12\n<strong>Explanation:</strong>\nfn.callPolyfill({"a": 5}, 7); // 12\ncallPolyfill sets the "this" context to {"a": 5}. 7 is passed as an argument.\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> \nfn = function tax(price, taxRate) { \n return `The cost of the ${this.item} is ${price * taxRate}`; \n}\nargs = [{"item": "burger"}, 10, 1,1]\n<strong>Output:</strong> "The cost of the burger is 11"\n<strong>Explanation:</strong> callPolyfill sets the "this" context to {"item": "burger"}. 10 and 1.1 are passed as additional arguments.\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul style=\"list-style-type:square;\">\n\t<li><code><font face=\"monospace\">typeof args[0] == 'object' and args[0] != null</font></code></li>\n\t<li><code>1 <= args.length <= 100</code></li>\n\t<li><code>2 <= JSON.stringify(args[0]).length <= 10<sup>5</sup></code></li>\n</ul>\n",
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"translatedTitle": "使用自定义上下文调用函数",
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"translatedContent": "<p>增强所有函数，使其具有 <code>callPolyfill</code> 方法。该方法接受一个对象 <code>obj</code> 作为第一个参数，以及任意数量的附加参数。<code>obj</code> 成为函数的 <code>this</code> 上下文。附加参数将传递给该函数（即 <code>callPolyfill</code> 方法所属的函数）。</p>\n\n<p>例如，如果有以下函数：</p>\n\n<pre>\nfunction tax(price, taxRate) {\n const totalCost = price * (1 + taxRate);\n console.log(`The cost of ${this.item} is ${totalCost}`);\n}\n</pre>\n\n<p>调用 <code>tax(10, 0.1)</code> 将输出 <code>\"The cost of undefined is 11\"</code> 。这是因为 <code>this</code> 上下文未定义。</p>\n\n<p>然而，调用 <code>tax.callPolyfill({item: \"salad\"}, 10, 0.1)</code> 将输出 <code>\"The cost of salad is 11\"</code> 。<code>this</code> 上下文被正确设置，函数输出了适当的结果。</p>\n\n<p>请在不使用内置的 <code>Function.call</code> 方法的情况下解决这个问题。</p>\n\n<p> </p>\n\n<p><strong class=\"example\">示例 1：</strong></p>\n\n<pre>\n<strong>输入：</strong>\nfn = function add(b) {\n return this.a + b;\n}\nargs = [{\"a\": 5}, 7]\n<b>输出：</b>12\n<strong>解释：</strong>\nfn.callPolyfill({\"a\": 5}, 7); // 12\n<code>callPolyfill </code>将 \"this\" 上下文设置为 <code>{\"a\": 5} </code>，并将 7 作为参数传递。\n</pre>\n\n<p><strong class=\"example\">示例 2：</strong></p>\n\n<pre>\n<b>输入：</b>\nfn = function tax(price, taxRate) { \n return `The cost of the ${this.item} is ${price * taxRate}`; \n}\nargs = [{\"item\": \"burger\"}, 10, 1,1]\n<b>输出：</b>\"The cost of the burger is 11\"\n<b>解释：</b><code>callPolyfill </code>将 \"this\" 上下文设置为 <code>{\"item\": \"burger\"} </code>，并将 10 和 1.1 作为附加参数传递。\n</pre>\n\n<p> </p>\n\n<p><strong>提示：</strong></p>\n\n<ul style=\"list-style-type:square;\">\n\t<li><code><font face=\"monospace\">typeof args[0] == 'object' and args[0] != null</font></code></li>\n\t<li><code>1 <= args.length <= 100</code></li>\n\t<li><code>2 <= JSON.stringify(args[0]).length <= 10<sup>5</sup></code></li>\n</ul>\n",
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"difficulty": "Medium",
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