Lodash Debounce - Javascript

Lodash debounce is a function provided by the popular Javascript utility library Lodash. It is a way to optimize a function in such a way that it is called only once during a certain period of time, even if it is invoked multiple times within that time period.

Installation

You can install Lodash in your project either via npm or via a CDN. Here is the npm command to install Lodash:

npm install lodash

Usage

Here's a basic example of how to use Lodash debounce:

import debounce from 'lodash/debounce';

function save() {
  console.log('Saving data...');
}

const debouncedSave = debounce(save, 1000);

window.addEventListener('resize', debouncedSave);

In this example, we create a function save() that will output a message to the console. We then use lodash debounce to create a new function debouncedSave() by wrapping save() with a debounce function that will wait for 1000ms before calling the original save() function.

We then add an event listener to the window object that will invoke debouncedSave() whenever the window is resized. Since debouncedSave() is used instead of save(), we can be sure that even if the window is resized multiple times within 1000ms, the save() function will only be called once.

Options

Lodash debounce takes two arguments: the function to debounce and the time interval to wait before calling the function. It also takes an optional third argument which is an options object that allows you to configure how the debounce function works.

Here are some of the options available:

• leading: if set to true, the function will be called immediately when it is invoked for the first time, even if the debounce time interval has not elapsed yet.
• trailing: if set to false, the debounce function will only call the original function when the time interval has elapsed and the function has not been called again during that time.

Here's an example that uses the leading option:

const debouncedSave = debounce(save, 1000, { leading: true });

window.addEventListener('resize', debouncedSave);

In this example, the leading option is set to true, so the save() function will be called immediately when the window.resize event is triggered for the first time, even if the debounce time interval has not elapsed yet.

Conclusion

Lodash debounce is a powerful tool that can help optimize your code by preventing certain functions from being called too frequently. By waiting for a certain time interval before invoking a function, you can ensure that your code runs smoothly and efficiently, even when dealing with events that are triggered frequently.