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#Teo garcia code#
#Teo garcia series#

#Teo garcia code#

Since we normally use JSX, the code will be transformed to React.createElement(.).

If you use class components it will invoke YourComponent.render().Įven when the process's name is rendering, at this point, the DOM has not been modified or altered, which could be a little tricky if you think as I did, about the meaning of render.

If you use function components it will invoke the function itself, something like Header(props).

It will collect from the root of your App all the components that requested a re-render because their state or their props changed.

Rendering is a process that is triggered by a change of state in some component of your application, when a state change occurs React: React synchronizes the changes in the DOM through three steps. Initially, I said that the concept we normally know as rendering is different in React, I personally considered rendering as the procedure of synchronizing changes in the DOM. The virtual DOM (VDOM) is a programming concept where an ideal, or “virtual”, representation of a UI is kept in memory and synced with the “real” DOM by a library such as ReactDOM. Perform calculations using the state and props and finally decide which elements of the actual DOM (the browser one, I mean haha) should be mutated.

Thus, the Virtual DOM came to represent the DOM tree in memory. Rendering the entire document tree is too costly as applications become more complex by mutations, we can understand any change that the DOM can undergo: an insertion/modification/deletion of an element or its properties. The Virtual DOM was a strategy that appeared to solve the modifications or mutations that the DOM suffers when using a web or mobile application. To understand why React is so fast it is important to know these four concepts: That's why Understanding rendering in React is something that all of us who use this library should understand. Performance problems can appear when your React application is continuously re-rendering, the application has scaled considerably and, the components are complex and expensive to represent. However, it is sometimes useful to go into a little more detail about how React does what it does. You are probably here because you have worked with React, interacted with their APIs, changed the state of your components, and seen the magic happen. To begin with, I will say that the concept of rendering in React is a little different from how we know it. Today I want to share with you what I have researched for a couple of weeks about how rendering works in React.

#Teo garcia series#

This year I started a series of posts called 'Coding with Mateo' My first post was about 6 ways to write a React component. I'm Mateo Garcia, I co-organize a community in Medellin, Colombia called React Medellin.