Add solution #2693

Author: JoshCrozier

README.md

@@ -433,6 +433,7 @@
 2666|[Allow One Function Call](./2666-allow-one-function-call.js)|Easy|
 2667|[Create Hello World Function](./2667-create-hello-world-function.js)|Easy|
 2677|[Chunk Array](./2677-chunk-array.js)|Easy|
+2693|[Call Function with Custom Context](./2693-call-function-with-custom-context.js)|Medium|
 2695|[Array Wrapper](./2695-array-wrapper.js)|Easy|
 2703|[Return Length of Arguments Passed](./2703-return-length-of-arguments-passed.js)|Easy|
 2704|[To Be Or Not To Be](./2704-to-be-or-not-to-be.js)|Easy|

solutions/2693-call-function-with-custom-context.js

@@ -0,0 +1,35 @@
+/**
+ * 2693. Call Function with Custom Context
+ * https://leetcode.com/problems/call-function-with-custom-context/
+ * Difficulty: Medium
+ *
+ * Enhance all functions to have the callPolyfill method. The method accepts an object obj as
+ * its first parameter and any number of additional arguments. The obj becomes the this context
+ * for the function. The additional arguments are passed to the function (that the callPolyfill
+ * method belongs on).
+ *
+ * For example if you had the function:
+ *
+ * function tax(price, taxRate) {
+ *   const totalCost = price * (1 + taxRate);
+ *   console.log(`The cost of ${this.item} is ${totalCost}`);
+ * }
+ *
+ * Calling this function like tax(10, 0.1) will log "The cost of undefined is 11". This is
+ * because the this context was not defined.
+ *
+ * However, calling the function like tax.callPolyfill({item: "salad"}, 10, 0.1) will log "The
+ * cost of salad is 11". The this context was appropriately set, and the function logged an
+ * appropriate output.
+ *
+ * Please solve this without using the built-in Function.call method.
+ */
+
+/**
+ * @param {Object} context
+ * @param {Array} args
+ * @return {null|boolean|number|string|Array|Object}
+ */
+Function.prototype.callPolyfill = function(context, ...args) {
+  return this.bind(context)(...args);
+}