Implement Debounce in Javascript

Debouncing in JavaScript is a practice used to improve browser performance. There might be some functionality in a web page which requires time-consuming computations. If such a method is invoked frequently, it might greatly affect the performance of the browser, as JavaScript is a single threaded language. Debouncing is a programming practice used to ensure that time-consuming tasks do not fire so often, that it stalls the performance of the web page. In other words, it limits the rate at which a function gets invoked.

When I implement like below, there is error I found with arrow function. With arrow function, this key word is bound to the orignal context where the function is created. So “The context is undefined” is printed for below snippet.

To avoid this problem, we need to replace arrow function with normal function like below, which will give the result “The context is mycontext” as expected. This key word is bound to the context of the function that is called.

Then, if the function has not already been executed, you will be able to stop the execution by calling the clearTimeout() method.

And if debounce is triggered again within the wait time, the setTimeout will be cleared by clearTimeout and a new setTimeout with wait time will be set again. This will prevent from frequent triggering of the function passed in debounce. For instance, below snippet shows how to avoid constantly triggering input event with every letter input when the user is typing a sentence.

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