Web apps can be complex and may require a lot of dynamic functionalities. One can opt for Vanilla JS to build their applications but if you have worked with Vanilla JS before, you know how messy it can get. Here's when JS frameworks like, React, Angular and Vue, come into the picture.
Let's start by answering two simple questions.
What is Vanilla JS?
Vanilla JS is nothing but plain JS without any external libraries or frameworks. Using this we can build powerful and cross-platform applications.
What is React?
In Vanilla JS, the code becomes very difficult to maintain if the application is large because in such cases the UI needs to be updated regularly. Here, to change a UI element you need to first find the element in the DOM and then update it. This is fine when you have to update only a single element but imagine doing this on long-form which a user needs to fill. This could be very memory and browser intensive.
This is where React comes in with a great feature i.e its own virtual DOM. The virtual DOM is a shortcut to bypass the manual work. It is a lightweight copy of the actual DOM. It has the same properties as the real DOM but lacks the power to make changes on the screen.
The most important and fundamental reason why modern frameworks are used is that, with Vanilla JS, keeping the UI in sync with the state is hard.
Let's understand this by taking an example
Consider Facebook. Say at a given time, your friends comment on a picture of yours and you want to see it immediately. You'd want to shift from liking posts to commenting or sharing without being slowed down.
Now, this can be done in Vanilla JS too, but the number of changes you'd have to do in the code would be very tedious. All this tiresome work can be avoided by using something like React.
Basically, with React, we can manage to keep the UI and the state synchronized with each other. In Vanilla JS, if you have to change the state, you would need to update the UI. One small mistake and your UI could be out of sync with your data.
Code organization and re-use is another important aspect of React. A component created only once can be used multiple times with different data.
Whether you should use Vanilla JS or React depends very much on your use case.
On the other hand, React which allows us to use reusable components and is capable of keeping the UI in sync with the state, can definitely solve this problem.
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Thanks for reading!