The document discusses a company's migration from their previous front end technologies to ReactJS. It describes the technical debt of their old system using NodeJS, custom Bootstrap, jQuery and other technologies. This led to poor performance as the application grew. The document then provides an overview of ReactJS and how it addresses these issues through its virtual DOM, component-based architecture, and use of props, states and refs. It also covers React concepts like lifecycles, patterns for developing presentational and container components, and the benefits React provides like one-way data flow, reusability, and faster development cycles.

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ReactJS - Front End
migration story @
Realtor.com
Khanh Dao
1/26/2018

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● A walk down memory lane
● Technical Debt
● ReactJS to rescue?
● Deep dive and lesson learned
● Q&A
Agenda
2

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Recalling the past...
3

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● NodeJS/NPM system
● Custom Bootstrap
● jQuery and plugins
● DustJS
● Bimo
● PubSub pattern
Recalling the past…(cont.)

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● Large scale UI component and modular support
● When application grow larger, heavy DOM
manipulation slow down client rendering and
performance.
● Lacking of data management system that should only
change the data needed to be change on DOM
rendering, state management of data is confusing.
Why didn’t it work for us?

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“React makes it painless to create interactive UIs.
Design simple views for each state in your application,
and React will efficiently update and render just the
right components when your data changes.”
Reference: https://reactjs.org/

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● Abstraction of actual
HTML DOM
● Store state independent
of the DOM and allow
compare to the DOM
What is a Virtual
DOM?

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Prop:
● Parameter to a function
● React.PropTypes is used for
data sanitization
States
● Hold the current state inside
component
○ getInitialState
○ setState
Ref
● Keep reference to component
Prop, State, Ref
class Button extends React.Component {
constructor() {
super();
this.state = {
count: 0,
};
}
updateCount() {
this.setState((prevState, props) => {
return { count: prevState.count + 1 }
});
}
render() {
return (
<button onClick={() => this.updateCount()}>
{this.props.name}: {this.state.count}
</button>);
}
}
ReactDOM.render(<Button name=”Click me” />,
mountNode);

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https://developmentarc.gitbooks.io/react-indepth/content/life_cycle/the_life_cycle_recap.html
React LifeCycle

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React
Component

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● Block of text
● Block of HTML
● Mixture of text and HTML
● A container for other components
What is a Component…?

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Why Components are important?
● Accelerate development with reusability so you don’t repeat
yourself
● Keep a consistent user experience across pages for the same
parts of your pages
● Optimize requirement and design process
● Speed up the transition from design to development

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● Presentational components
○ How things look
○ Accept props from container to render HTML block
○ No dependencies with application code
● Container components
○ How things work
○ Behavioral components
Patterns of developing component

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- One way directional data flow is definitely produce more stable
and predictable code
- Stable in-house eco system for share and reuse
- Unit test to ensure code quality.
- We’ve developed over 30 presentational UI components and over 8
behavioral components that share across multiple teams
- Faster UX/UI cycle as team can adopt a change in component more
quickly through seamless API interface, while expecting less bugs
React Benefits

16. THANK
YOU© 2016 Move, Inc. All rights reserved. Do not copy or distribute. 16
khanh.dao@move.com
https://github.com/lelea2