Add apply polyfill

Author: sudheerj

src/javascript/algorithms/misc/polyfill/function/apply.js

@@ -1,4 +1,4 @@
-Function.prototype.myCall = function(thisArg, ...args) {
+Function.prototype.myApply = function(thisArg, args=[]) {
     thisArg = thisArg || globalThis;
 
     const uniqueId = Symbol('fn');
@@ -10,7 +10,7 @@ Function.prototype.myCall = function(thisArg, ...args) {
     return result;
 }
 
-Function.prototype.myCall1 = function(thisArg, ...args) {
+Function.prototype.myApply1 = function(thisArg, args=[]) {
     const uniqueId = Symbol('fn');
     const wrappedObj = Object(thisArg);
     Object.defineProperty(wrappedObj, uniqueId, {
@@ -21,11 +21,11 @@ Function.prototype.myCall1 = function(thisArg, ...args) {
     return wrappedObj[uniqueId](...args);
 }
 
-Function.prototype.myCall2 = function(thisArg, ...args) {
-    return this.apply(thisArg, [...args]);
+Function.prototype.myApply2 = function(thisArg, args=[]) {
+    return this.call(thisArg, ...args);
 }
 
-Function.prototype.myCall3 = function(thisArg, ...args) {
+Function.prototype.myApply3 = function(thisArg, args=[]) {
     return this.bind(thisArg, ...args)();
 }
 
@@ -38,7 +38,7 @@ function details(age = 30) {
     return this.firstName + ' '+this.lastName + ' is ' + age + ' years old';
 }
 
-console.log(details.myCall(person1, 35));
-console.log(details.myCall1(person1, 35));
-console.log(details.myCall2(person1, 35));
-console.log(details.myCall3(person1, 35));
+console.log(details.myApply(person1, [35]));
+console.log(details.myApply1(person1, [35]));
+console.log(details.myApply2(person1, [35]));
+console.log(details.myApply3(person1, [35]));

src/javascript/algorithms/misc/polyfill/function/call.js

@@ -0,0 +1,44 @@
+Function.prototype.myCall = function(thisArg, ...args) {
+    thisArg = thisArg || globalThis;
+
+    const uniqueId = Symbol('fn');
+    thisArg[uniqueId] = this;
+
+    const result = thisArg[uniqueId](...args);
+    delete thisArg[uniqueId];
+
+    return result;
+}
+
+Function.prototype.myCall1 = function(thisArg, ...args) {
+    const uniqueId = Symbol('fn');
+    const wrappedObj = Object(thisArg);
+    Object.defineProperty(wrappedObj, uniqueId, {
+        enumerable: false,
+        value: this
+    });
+
+    return wrappedObj[uniqueId](...args);
+}
+
+Function.prototype.myCall2 = function(thisArg, ...args) {
+    return this.apply(thisArg, [...args]);
+}
+
+Function.prototype.myCall3 = function(thisArg, ...args) {
+    return this.bind(thisArg, ...args)();
+}
+
+const person1 = {
+    firstName: 'Sudheer',
+    lastName: 'Jonna'
+}
+
+function details(age = 30) {
+    return this.firstName + ' '+this.lastName + ' is ' + age + ' years old';
+}
+
+console.log(details.myCall(person1, 35));
+console.log(details.myCall1(person1, 35));
+console.log(details.myCall2(person1, 35));
+console.log(details.myCall3(person1, 35));