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"title": "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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"exampleTestcases": "function add(b) { return this.a + b; }\n[{\"a\":5},7]\nfunction tax(price, taxRate) { return `The cost of the ${this.item} is ${price * taxRate}`; }\n[{\"item\":\"burger\"},10,1.1]",
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"code": "/**\n * @param {Object} context\n * @param {Array} args\n * @return {null|boolean|number|string|Array|Object}\n */\nFunction.prototype.callPolyfill = function(context, ...args) {\n\t\n}\n\n/**\n * function increment() { this.count++; return this.count; }\n * increment.callPolyfill({count: 1}); // 2\n */",
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"lang": "TypeScript",
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"code": "type JSONValue = null | boolean | number | string | JSONValue[] | { [key: string]: JSONValue };\n\ndeclare global { \n interface Function {\n callPolyfill(context: Record<string, JSONValue>, ...args: JSONValue[]): JSONValue;\n\t}\n}\n\nFunction.prototype.callPolyfill = function(context, ...args): JSONValue {\n\t\n}\n\n/**\n * function increment() { this.count++; return this.count; }\n * increment.callPolyfill({count: 1}); // 2\n */",
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"sampleTestCase": "function add(b) { return this.a + b; }\n[{\"a\":5},7]",
"metaData": "{\n \"name\": \"callPolyfill\",\n \"params\": [\n {\n \"type\": \"string\",\n \"name\": \"context\"\n },\n {\n \"type\": \"string\",\n \"name\": \"args\"\n }\n ],\n \"return\": {\n \"type\": \"string\"\n },\n \"languages\": [\n \"javascript\",\n \"typescript\"\n ],\n \"manual\": true\n}",
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