javascript interview questions and answers || call bind apply in javascript || Rohit Azad Malik

javascript interview questions and answers || call bind apply in javascript || Rohit Azad Malik

In this video, we will start by explaining what call(), bind(), and apply() methods are and how they work in JavaScript.
We will explore the differences between these methods, and you will learn when to use each method in your code. Additionally, we will cover some common interview questions related to these methods and show you how to solve them step by step. The video will be filled with code examples to help you better understand how these methods work in practice.
By the end of the video, you will have a solid understanding of call(), bind(), and apply() methods and feel more confident in your coding skills.

Ye JavaScript ke methods hain jo humein ek function ke this keyword ko set karne ke liye use kiye jaate hain.

Sabse pehle this keyword ke bare mein jaan lete hain. Jab aap ek object ke andar koi function define karte hain, to us function ke andar this keyword us object ko refer karta hai.
Lekin agar aap us function ko baahar nikal ke call karte hain, to this keyword global object window ko refer karega. Isiliye humein call, bind aur apply methods ka use karna hota hai.

call() method ek function ko call karta hai aur us function ke this keyword ko set karta hai. Aap call() method ko use karke, ek function ke arguments ko comma-separated list ki form mein pass kar sakte hain.

bind() method bhi ek function ke this keyword ko set karta hai, lekin wo us function ko call nahi karta hai. bind() method ek new function return karta hai, jiska this keyword set hota hai.

apply() method bhi ek function ko call karta hai aur us function ke this keyword ko set karta hai.
call() method ki tarah, apply() method ko bhi ek object se this keyword ko set kar sakte hain.
Iske alawa, apply() method ko arguments ko ek array ki form mein pass kiya jata hai.

Ummid hai ki aapko call(), bind(), aur apply() methods ke bare mein samajh aa gaya hoga.
Agar aapke paas koi aur sawaal hai, to aap poochh sakte hain.

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event capturing and event bubbling in javascript interview questions in hindi-event stoppropagation

event capturing and event bubbling in javascript interview questions in hindi-event stoppropagation

JavaScript is one of the most popular programming languages used to create dynamic and interactive web pages. It has various built-in functionalities and methods to help developers achieve a wide range of tasks. One of these functionalities is event handling, which allows developers to execute specific actions based on user actions or other events.

In JavaScript, events can be captured or bubbled depending on their propagation path. Understanding event capturing and event bubbling is essential for every web developer. In this blog, we'll explore what event capturing and event bubbling are, how they work, and how to stop them from propagating using the stopPropagation() method.

What is Event Capturing?
Event capturing, also known as the "capturing phase," is the first phase in the event propagation process. It occurs when an event is triggered on an element, and the event handler starts at the topmost element in the DOM tree and works its way down to the target element.

What is Event Bubbling?
Event bubbling, also known as the "bubbling phase," is the second phase in the event propagation process. It occurs when an event is triggered on an element, and the event handler starts at the target element and works its way up to the topmost element in the DOM tree.

How to Stop Event Propagation
Sometimes, we may want to stop event propagation from happening. For example, we may have nested elements with the same event listener, and we only want the event to be triggered on the child element without propagating to the parent element. In such cases, we can use the stopPropagation() method.

In this blog post, we've learned about event capturing and event bubbling in JavaScript. We've seen how event propagation works, and we've learned how to stop event propagation using the stopPropagation() method. Event capturing and event bubbling are essential concepts for every web developer to understand, as they canimpact the way events are handled in a web page, especially when multiple event listeners are attached to the same element. Knowing how to control event propagation can help us create more efficient and effective code that performs the desired actions and provides a better user experience. So, it's essential to understand the differences between event capturing and event bubbling and how they work in JavaScript.

Is video mein hum aapko Javascript mein event capturing aur event bubbling ke baare mein detail se batayenge jo web developers ke liye bahut important hoti hai. Hum is video mein dikhayenge ki event capturing aur event bubbling kaise kaam karte hain aur inmein kya antar hota hai.

Is video mein hum event stopPropagation ko kaise upyog kar sakte hain jo event capturing ya event bubbling ko rokne ke liye bahut useful hota hai. Iske alawa, hum un situations ko dekhenge jab event capturing ya event bubbling ko bypass karna avashyak hota hai.

Is video ke ant tak aap Javascript mein event capturing aur event bubbling ko gehrai se samajhenge aur apni web application mein in techniques ka upyog karke adhik flexibility aur niyantran prapt karenge.

इस वीडियो में हम जावास्क्रिप्ट में इवेंट कैप्चर और इवेंट बबलिंग की विस्तृत जानकारी देंगे जो वेब डेवलपर्स के लिए बहुत महत्वपूर्ण होती है। हम इस वीडियो में दिखाएंगे कि इवेंट कैप्चर और इवेंट बबलिंग कैसे काम करते हैं और इनमें क्या अंतर होता है।

इस वीडियो में हम इवेंट स्टॉपप्रोपेगेशन को कैसे उपयोग कर सकते हैं जो इवेंट कैप्चर या इवेंट बबलिंग को रोकने के लिए बहुत उपयोगी होता है। इसके अलावा, हम उन स्थितियों को देखेंगे जब इवेंट कैप्चर या इवेंट बबलिंग को बाइपास करना आवश्यक होता है।
इस वीडियो के अंत तक आप जावास्क्रिप्ट में इवेंट कैप्चर और इवेंट बबलिंग को गहराई से समझेंगे और अपनी वेब एप्लिकेशन में इन तकनीकों का उपयोग करके अधिक फ्लेक्सिबिलिटी और नियंत्रण प्राप्त करेंगे।