Update js-pw.md

Author: learning-zone

js-pw.md

@@ -2739,103 +2739,6 @@ console.log(romanize(3)); // III
     <b><a href="#javascript-coding-practice">↥ back to top</a></b>
 </div>
 
-## Q. Write a program to check if parenthesis is malformed or not?
-
-**Example:**
-
-```js
-Input: "}{{}}"
-Output: false
-
-Input: "{{[]}}"
-Output: true
-```
-
-<details><summary><b>Answer</b></summary>
-
-```js
-function matchParenthesis(str) {
-  let obj = { "{": "}", "(": ")", "[": "]" };
-  let result = [];
-  for (let s of str) {
-    if (s === "{" || s === "(" || s === "[") {
-      // All opening brackets
-      result.push(s);
-    } else {
-      if (result.length > 0) {
-        let lastValue = result.pop(); // pop the last value and compare with key
-        if (obj[lastValue] !== s) {
-          // if it is not same then it is not formated properly
-          return false;
-        }
-      } else {
-        return false; // empty array, there is nothing to pop. so it is not formated properly
-      }
-    }
-  }
-  return result.length === 0;
-}
-
-console.log(matchParenthesis("}{{}}")); // false 
-console.log(matchParenthesis("{{[]}}")); // true
-```
-
-</details>
-
-<div align="right">
-    <b><a href="#javascript-coding-practice">↥ back to top</a></b>
-</div>
-
-## Q. Create Custom Event Emitter class?
-
-**Example:**
-
-```js
-Output:
-'Custom event called with argument: a,b,[object Object]'
-'Custom event called without argument'
-```
-
-<details><summary><b>Answer</b></summary>
-
-```js
-class EventEmitter {
-  constructor() {
-    this.holder = {};
-  }
-
-  on(eventName, fn) {
-    if (eventName && typeof fn === "function") {
-      this.holder[eventName] = this.holder[eventName] || [];
-      this.holder[eventName].push(fn);
-    }
-  }
-
-  emit(eventName, ...args) {
-    let eventColl = this.holder[eventName];
-    if (eventColl) {
-      eventColl.forEach((callback) => callback(args));
-    }
-  }
-}
-
-let e = new EventEmitter();
-e.on("myCustomEvent", function (args) {
-  console.log(`Custom event called with arguments: ${args}`);
-});
-e.on("myCustomEvent", function () {
-  console.log(`Custom event called without argument`);
-});
-
-e.emit("myCustomEvent", ["a", "b"], { firstName: "Umesh", lastName: "Gohil" });
-```
-
-</details>
-
-<div align="right">
-    <b><a href="#javascript-coding-practice">↥ back to top</a></b>
-</div>
-
 ## Q. Write a program to move all zeroes to end?
 
 **Example:**