Merge branch 'main' into main

Author: Sanketmundada

code-snippets/promises.md

@@ -1,19 +1,121 @@
 <div align="center">
-  <h1>Promises</h1>
+<h1>Promises</h1>
 </div>
 
 <ol>
 <li>
 
-**Promise is introduced in which version of JavaScript ?**
+**Promise is introduced in which version of JavaScript?**
 
 - A: `ES5`
 - B: `ES6`
 - C: `ES8`
 - D: `ES8`
 
 <br/>
+<details>
+<summary><b>Answer</b></summary>
+<p>
+
+#### Option: B
+
+</p>
+</details>
+</li>
+
+---
+
+<li>
+
+**When do we say that a promise is 'settled'?**
+
+- A: `If it is fulfilled`
+- B: `If it is rejected`
+- C: `If it is pending`
+- D: `If it is either fulfilled or rejected`
+
+<br/>
+<details>
+<summary><b>Answer</b></summary>
+<p>
+
+#### Option: D
+
+</p>
+</details>
+</li>
+
+---
+
+<li>
+
+**What will be the output?**
+
+```JS
+const validateUsernamePassword = (username, password) => {
+	return new Promise((resolve, reject) => {
+		if (username == "ABC" && password == "123") {
+			resolve("SUCCESS!");
+		} else {
+			reject("FAILURE!");
+		}
+	});
+};
+
+validateUsernamePassword("ABC", "123")
+	.then((msg) => {
+		console.log(msg);
+	})
+	.catch((err) => {
+		console.log(err);
+	});
+```
+
+- A: `SUCCESS!`
+- B: `FAILURE!`
+
+<br/>
+<details>
+<summary><b>Answer</b></summary>
+<p>
+
+#### Option: A
+
+</p>
+</details>
+</li>
+
+---
 
+<li>
+
+**While**
+
+```JS
+let setTimeoutResolveReject = new Promise((resolve, reject) => {
+	setTimeout(() => {
+		resolve("YES");
+	}, 3000);
+	setTimeout(() => {
+		reject("NO")
+	}, 2000);
+});
+
+setTimeoutResolveReject
+.then((msg) => {
+	console.log(msg);
+})
+.catch((err) => {
+	console.log(err);
+})
+```
+
+- A: `YES`
+- B: `NO`
+- C: `NO\nYES`
+- D: `YES\nNO`
+
+<br/>
 <details>
 <summary><b>Answer</b></summary>
 <p>
@@ -22,6 +124,50 @@
 
 </p>
 </details>
+</li>
 
+---
+
+<li>
+
+**While execution, the random value of `randomWaitTime` generated was `3800`. What will be the output?**
+
+```JS
+let examplePromise = new Promise((resolve, reject) => {
+	let timeout = 3000;
+	let randomWaitTime = Math.floor(Math.random() * 5000) + 1;
+	console.log(randomWaitTime);
+	if (randomWaitTime <= timeout) {
+		setTimeout(() => {
+			resolve();
+		}, randomWaitTime);
+	} else {
+		setTimeout(() => {
+			reject();
+		}, randomWaitTime);
+	}
+});
+
+examplePromise
+	.then(() => {
+		console.log("RESOLVED!");
+	})
+	.catch(() => {
+		console.log("REJECTED!");
+	});
+```
+
+- A: `RESOLVED!`
+- B: `REJECTED!`
+
+<br/>
+<details>
+<summary><b>Answer</b></summary>
+<p>
+
+#### Option: B
+
+</p>
+</details>
 </li>
 </ol>