Added new snippet to Objects, Promises and hoisting

code-snippets/hoisting.md

@@ -344,4 +344,40 @@ line number 2 10
 
 </li>
 </li>  
+
+---
+
+<li>
+
+**What will be the output?**
+
+```JS
+function foo() {
+  let a = b = 0;
+  a++;
+  return a;
+}
+
+foo();
+console.log(typeof a);
+console.log(typeof b);
+```
+
+- A: `number \n number`
+- B: `undefined \n number`
+- C: `undefined \n undefined`
+- D: `number \n undefined`
+
+<br/>
+<details>
+<summary><b>Answer</b></summary>
+
+<p>
+
+#### Option: B
+
+</p>
+
+</details>
+</li>
 </ol>

code-snippets/objects.md

@@ -62,6 +62,7 @@ console.log(TDK);
 </li>
 
 ---
+
  <li>
 
 **What will be the output?**
@@ -134,5 +135,29 @@ console.log(greet({ name: 'Narendra Modi' }))
 
 ---
 
+<li>
+
+**What will be the output?**
+
+```JS
+const sample = ["xyz", "abc", "test", "ryan", "apple"];
+delete sample[3];
+console.log(sample.length);
+```
+
+- A: `4`
+- B: `5`
+- C: `Error updating the constant variable.`
+
+<br/>
+<details>
+<summary><b>Answer</b></summary>
+<p>
+
+#### Option: B
+
+</p>
+</details>
+</li>
 
 </ol>

code-snippets/promises.md

@@ -323,4 +323,41 @@ p.catch(error => console.log(error.message))
 </details>
 </li>
 
+---
+
+<li>
+
+**What's the order of output of the following Promise operation?**
+
+```JS
+console.log('initial');
+setTimeout(function() {
+   console.log('setTimeout');
+}, 0);
+var promise = new Promise(function(resolve, reject) {
+   resolve();
+});
+promise.then(function(resolve) {
+   console.log('1st Promise');
+})
+.then(function(resolve) {
+   console.log('2nd Promise');
+});
+console.log('final');
+```
+
+- A: `initial \n 1st Promise \n 2nd Promise \n setTimeout \n final`
+- B: `initial \n final \n 1st Promise \n 2nd Promise \n setTimeout`
+- C: `initial \n setTimeout \n 1st Promise \n 2nd Promise \n final`
+- D: `initial \n final \n 1st Promise \n setTimeout \n 2nd Promise`
+
+<br/>
+<details>
+<summary><b>Answer</b></summary>
+<p>
+
+#### Option: B
+
+</li>
+
 </ol>