diff --git a/README.md b/README.md
index 160449f..dcd01f3 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,5 @@
# JavaScript-snippets
-> Click :star:if you like the project. Pull Request are highly appreciated. Follow us on [Facebook](https://www.facebook.com/snippetsJS)
+> Click :star: if you like the project. Pull Request are highly appreciated. Follow us on [Facebook](https://www.facebook.com/snippetsJS)
### Table of Contents
| No. | Questions |
@@ -37,8 +37,20 @@
|31 | [Preventing paste into an input field](#Preventing-paste-into-an-input-field)|
|32 | [The void operator](#The-void-operator)|
|33 | [replaceAll](#replaceAll)|
-
-
+|34 | [Required Function Params](#Required-Function-Params)|
+|35 | [Get input value as a number](#Get-input-value-as-a-number)|
+|36 | [reduceRight](#reduceRight)|
+|37 | [Abort Fetch](#Abort-Fetch)|
+|38 | [How to change the value of an object which is inside an array](#How-to-change-the-value-of-an-object-which-is-inside-an-array)|
+|39 | [Numeric separators allow us to improve our code readability](#Numeric-separators-allow-us-to-improve-our-code-readability)|
+|40 | [pay attention when using every](#pay-attention-when-using-every)|
+|41 | [How to convert an array of key-value tuples into an object](#How-to-convert-an-array-of-key-value-tuples-into-an-object)|
+|42 | [Native text to speech JS](#Native-text-to-speech-JS)|
+|43 | [toFixed](#toFixed)|
+|44 | [generate randomUUID](#generate-random-uuid)|
+|45 | [structuredClone](#structuredClone)|
+|46 | [get device orientation](#get-device-orientation)|
+|47 | [CONST vs LET vs VAR](#const-let-var)|
**[⬆ Back to Top](#table-of-contents)**
### How to generate a random number in a given range
@@ -711,8 +723,285 @@ const updatedStr = str.replaceAll('example', 'snippet'); //'this is a JSsnippets
```
+**[⬆ Back to Top](#table-of-contents)**
+### Required Function Params
+Expanding on the default parameter technique, we can mark a parameter as mandatory
+
+```javascript
+const isRequired = () => {
+ throw new Error( 'This is a mandatory parameter.' );
+}
+
+
+const getPage = ( pageName = 'Jssnippets', url = isRequired() ) => {
+ return `${pageName} ${url}`;
+}
+
+console.log(getPage());
+
+//In the above code, url will be undefined and that will try to set the default value for it which is the isRequired() function. It will throw an error as,
+
+//Uncaught error: This is a mandatory parameter.
+//at isRequired
+
+```
+
+
+
+
+**[⬆ Back to Top](#table-of-contents)**
+### Get input value as a number
+
+```javascript
+
+
+
+function checkMyType(event){
+
+ console.log(typeof event.target.value) // string
+ console.log(typeof event.target.valueAsNumber ) // number
+
+}
+
+
+```
+**[⬆ Back to Top](#table-of-contents)**
+### reduceRight
+
+```javascript
+
+const arr = ["a", "b", "c", "d", "e"]
+
+const reduceArray = arr.reduce((acc, current) => {
+ return acc + current
+}, "")
+//return abcde
+
+const reduceRightArray = arr.reduceRight((acc, current) => {
+ return acc + current
+}, "")
+//return edcba
+
+```
+
+
+**[⬆ Back to Top](#table-of-contents)**
+### Abort Fetch
+
+```javascript
+
+
+//HTML
+
+
+
+//JS
+let controller;
+
+document.querySelector('#download').addEventListener('click', () => {
+ controller = new AbortController();
+ const signal = controller.signal;
+ fetch('https://cdn.plyr.io/static/demo/View_From_A_Blue_Moon_Trailer-576p.mp4', {signal})
+ .then(() => console.log('done'));
+});
+
+document.querySelector('#abort').addEventListener('click', function() {
+ controller.abort();
+});
+
+```
+
+
+**[⬆ Back to Top](#table-of-contents)**
+### How to change the value of an object which is inside an array
+
+```javascript
+
+const state = [
+ {
+ userId: 1,
+ name: "JSSnippets",
+ isOwner: false,
+ },
+ {
+ userId: 2,
+ name: "React",
+ isOwner: false,
+ },
+ {
+ userId: 3,
+ name: "Vue",
+ isOwner: false,
+ },
+ {
+ userId: 4,
+ name: "Angular",
+ isOwner: false,
+ },
+];
+
+const newState = state.map((obj) =>
+ obj.name === "JSSnippets" ? { ...obj, isOwner: true } : obj
+);
+
+```
+
+**[⬆ Back to Top](#table-of-contents)**
+### Numeric separators allow us to improve our code readability
+
+```javascript
+100_000_000 === 100000000 // true
+300_000 === 300000 //true
+
+```
+
+
+**[⬆ Back to Top](#table-of-contents)**
+### pay attention when using every
+
+Calling this method on an empty array will return true for any condition!
+
+
+```javascript
+
+const arr = []
+const result = arr.every(x=> x==5)
+console.log(result) //true
+
+```
+
+
+
+
+
+**[⬆ Back to Top](#table-of-contents)**
+### How to convert an array of key-value tuples into an object
+
+
+```javascript
+
+const JSarr = [
+ ['name', 'JSsnippets'],
+ ['address', 'worldwide'],
+ ['year', '2018'],
+ ['followers', '15000']
+
+];
+
+const obj = Object.fromEntries(JSarr);
+//{
+// "name": "JSsnippets",
+// "address": "worldwide",
+// "year": "2018",
+// "followers": "15000"
+//}
+```
+
+**[⬆ Back to Top](#table-of-contents)**
+### Native text to speech JS
+
+
+```javascript
+
+const startSpeaking=()=>{
+
+ let msg = document.getElementById("text-to-speech").value;
+ let speech = new SpeechSynthesisUtterance();
+
+ speech.lang = "en-US";
+ speech.text = msg;
+ speech.volume = 1;
+ speech.rate = 1;
+ speech.pitch = 1;
+
+ window.speechSynthesis.speak(speech);
+}
+
+
+```
+
+**[⬆ Back to Top](#table-of-contents)**
+### toFixed
+
+Warning: Floating point numbers cannot represent all decimals precisely in binary. This can lead to unexpected results, such as 0.1 + 0.2 === 0.3 returning false .
+
+```javascript
+
+123.678.toFixed() // Returns '124'
+123.678.toFixed(1) // Returns '123.7': Note rounding
+
+2.35.toFixed(1) // Returns '2.4'. Note it rounds up
+2.65.toFixed(1) // Returns '2.6'. Note it rounds down -why??? see the warning above
+
+```
+
+
+**[⬆ Back to Top](#table-of-contents)**
+### generate random uuid
+
+The randomUUID() method of the Crypto interface is used to generate a v4 UUID using a cryptographically secure random number generator.
+
+```javascript
+
+crypto.randomUUID() // print in console '460ff1e6-2106-4848-833d-5c5b3bfdc943'
+
+crypto.randomUUID() // print in console '9a91c014-d1b1-453a-8091-ef8b9b48b14a'
+
+
+```
+
+
+**[⬆ Back to Top](#table-of-contents)**
+### structuredClone
+
+If you want to deep clone a value in Node.js, you no longer need to use a library or the JSON.parse(JSON.stringify(value)) hack. You can use the new global function structuredClone()
+
+```javascript
+
+const user = {
+ name: "JS Snippets",
+ address: { street: "Original Road", city: "Placeshire" },
+};
+
+const clonedUser = structuredClone(user);
+
+clonedUser.address.street = "New Road";
+
+console.log("user.address.street:", user.address.street);
+// > Original Road
+
+console.log("clonedUser.address.street:", clonedUser.address.street);
+// > New Road
+
+
+```
+
+**[⬆ Back to Top](#table-of-contents)**
+### get device orientation
+
+Browsers expose a global variable named screen, which we’ll use to access the information we need.
+
+```javascript
+
+function getOrientation() {
+ const isPortrait = screen.orientation.type.startswith('portrait')
+ return isPortrait ? 'portrait' : 'landscape'
+}
+
+```
+
+**[⬆ Back to Top](#table-of-contents)**
+### CONST vs LET vs VAR
+
+| | const | Let | Var |
+|------------------------|-------|-----|-----|
+| Can be Reaasigned? | :x: | :white_check_mark: |:white_check_mark: |
+| Cab be Redeclared? | :x: | :x: | :white_check_mark: |
+| Block Scope | :white_check_mark: |:white_check_mark: | :x: |
+| Function Scope | :white_check_mark: | :white_check_mark: | :white_check_mark: |
+| Stored in Global Scope | :x: | :x: | :white_check_mark: |