How to build and implement Debounce in Javascript- Frontend Interview Question

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In the world of web development, user input is a critical aspect that developers must take into consideration when creating a seamless user experience. However, user input can also lead to unintended consequences, such as triggering multiple events due to rapid clicks or keypresses. This is where debouncing comes into play. Debouncing is a technique used in web development to limit the frequency of an event by ensuring that it only triggers once after a set period of time, even if the event is triggered multiple times during that period.

Debouncing is commonly used in scenarios such as handling button clicks, form submissions, or filtering search results. For example, imagine a search bar that automatically filters results as the user types. Without debouncing, each keystroke would trigger a new search, resulting in a flurry of requests and potentially slowing down the performance of the web page. By implementing debouncing, the search will only trigger after the user has stopped typing for a set period of time, resulting in a smoother and more efficient search experience.

In the video, viewers will learn not only what debouncing is and its common use cases but also how to build and implement it from scratch in JavaScript. JavaScript is a popular programming language used for web development, and understanding debouncing is an essential skill for any developer working with user input. By following along with the video tutorial, viewers will gain a practical understanding of how to implement debouncing in their own web development projects, making for a smoother and more efficient user experience.

[JobFernandez-qcsc]

Shivam, At 9:47 on line 21, the condition inside the setTimeout() should be checking whether firstCallImmediate is not true.
Great video, by the way. ❤

[Arunnn]

This is the only YouTube video that demonstrates a debounce that invokes the function before the delay rather that after. But the explanation could have been built more from the ground up to really explain it.

[xO]

Debouncing here happens after timeout of the last keyup, not first. Thus if keyup happens in (delay - smallDelta) then expensive function will be never expected, no?

[akbrosgaming]

how is callback inside setTimeout executing when immediate is always true ?

[clumsycoco]

setting timer = null inside the setTimeout would ensure when Immediate=true, that we never get into the loop ?

don't really understand why even have that part if immediate is true.

[trivedi]

can you give some kind of discount for indian student i don't have visa card, shivam any razorpay link?