Fixed major typos

Author: tejas-mn

web/src/pages/challenges/async.mdx

@@ -220,7 +220,7 @@ callbackManager([asyncFunc1, asyncFunc2, asyncFunc3]);
 
 **Notes**
 
-3 asynchrounous functions are considered here, but the program should work for any number
+3 asynchronous functions are considered here, but the program should work for any number
 
 ---
 
@@ -316,7 +316,7 @@ asyncFunc1()
   .then(asyncFunc2)
   .then(asyncFunc3)
   .catch(() => {
-    console.log("Error occured in one of the async function");
+    console.log("Error occurred in one of the async function");
   });
 ```
 

web/src/pages/challenges/collections.mdx

@@ -274,7 +274,7 @@ Though 1st solution is verbose compared to 2nd, but has good performance
 
 ### 11. Find the number of occurences of minimum value in the numbers list
 
-- `filter` method can be used to fetch all the minimum values and we can get the count of those valuses
+- `filter` method can be used to fetch all the minimum values and we can get the count of those values
 
 ```js copy
 const min = Math.min(...arr);

web/src/pages/challenges/dom.mdx

@@ -9,7 +9,7 @@ document.querySelector(".my-class"); // element having a class 'my-class'
 
 **Notes**
 
-Above selectors are used to select a first matching element reference even if mutliple matches be there
+Above selectors are used to select a first matching element reference even if multiple matches be there
 
 **References**
 

web/src/pages/challenges/functions.mdx

@@ -1,4 +1,4 @@
-### 1. Design a Calulator interface for 2 number inputs which can perform sum, difference, product and dividend whenever invoked on the same interface
+### 1. Design a Calculator interface for 2 number inputs which can perform sum, difference, product and dividend whenever invoked on the same interface
 
 ```js copy
 // Example
@@ -412,7 +412,7 @@ function memoize(fn) {
   return function () {
     const key = JSON.stringify(arguments);
 
-    // if the caculations have already been done for inputs, return the value from cache
+    // if the calculations have already been done for inputs, return the value from cache
     if (cache.has(key)) {
       return cache.get(key);
     } else {

web/src/pages/challenges/objects.mdx

@@ -282,7 +282,7 @@ obj.counter; // 3
 ```
 
 - The access to the property of the object can be configured through property `getter`
-- A separate private variable can be maintained track the value and getter on each access to increment and return the value
+- A separate private variable can be maintained to track the value and getter on each access to increment and return the value
 
 ```js copy
 function counterObject() {
@@ -445,7 +445,7 @@ emp.getSalary(); // 11000
 
 **Notes**
 
-Class in JavaScript is functionality to achieve class based model on top of prototype based programming model of JavaScript
+Class in JavaScript is a functionality to achieve class based model on top of prototype based programming model of JavaScript
 
 **References**
 

web/src/pages/challenges/primitives.mdx

@@ -114,7 +114,7 @@ str
 
 ### 6. Write a program to reverse a given integer number
 
-- The remainder of the number can be fetched and the number can be divided by 10 to remvoe the the digit in loop till number becomes 0
+- The remainder of the number can be fetched and the number can be divided by 10 to remove the digit in loop till number becomes 0
 - A simple approach to reverse a number could also be to convert it in to a string and then reverse it
 
 ```js copy
@@ -153,7 +153,7 @@ str.replaceAll(" ", "_");
 
 **Notes**
 
-`replace` is also an inbuilt String function on prototype which can be used to replace the 1st occurence of the string with another string
+`replace` is also an inbuilt String function on prototype which can be used to replace the 1st occurrence of the string with another string
 
 **References**
 

web/src/pages/concepts/async.mdx

@@ -176,7 +176,7 @@ fetchData("https://reqbin.com/echo/get/json")
 
 **Notes**
 
-XHR reuqest is no more in use and all the modern browsers use `fetch` API which is based on promise
+XHR request is no more in use and all the modern browsers use `fetch` API which is based on promise
 
 **References**
 
@@ -243,7 +243,7 @@ controller.abort();
 
 ### 8. Show the working of async await work with promises
 
-- `async` functions are asynchronous functions in which the asynchrous code can be executed in synchronous looking manner using `await`
+- `async` functions are asynchronous functions in which the asynchronous code can be executed in synchronous looking manner using `await`
 - `await` expects a promise and the execution will stop until the promise is resolved
 - If promise gets rejected, error is thrown with failure reason which can be handled using simple try-catch block
 

web/src/pages/concepts/collections.mdx

@@ -9,7 +9,7 @@ const arr = [];
 ```
 
 ```js copy
-// consturctor form
+// constructor form
 const arr = new Array();
 ```
 

web/src/pages/concepts/functions.mdx

@@ -352,7 +352,7 @@ Array and object are used in the programs to contain multiple values
 
 ---
 
-### 13. Write a function which can set default values to the parameters of function when an argument is not passed. Also show how to use exisiting parameters to set the value of another parameter
+### 13. Write a function which can set default values to the parameters of function when an argument is not passed. Also show how to use existing parameters to set the value of another parameter
 
 - Default function parameters allow named parameters to be initialized with default values if no value or undefined is passed
 

web/src/pages/concepts/objects.mdx

@@ -1,6 +1,6 @@
 ### 1. Show the different ways of creating an object
 
-- Object can be created using Object constuctor
+- Object can be created using Object constructor
 - Object can also be created using Object literal form
 - Object can be created using `new` keyword to constructor function
 - Object can be created using Class
@@ -253,7 +253,7 @@ Object.defineProperty(obj, "prop", {
 
 **Notes**
 
-Except `value`, other accessort mentioned accept true or false
+Except `value`, other accessor mentioned accept true or false
 
 **References**
 
@@ -293,7 +293,7 @@ Object.isFrozen(obj); // true
 
 ### 11. Modify the given object so that it can be used inside a for...of loop
 
-- Symbol iterator can be used to define the iterator on the object
+- `Symbol.iterator` can be used to define the iterator on the object
 - The values of the object can accessed with `for..of` the way we can do it for array
 
 ```js copy