- AVirtual DOM
- BDOM
- CElements
- DComponents
ReactJS - Basic - Quiz
- AControl
- BModel
- CView
- DAll the options
- AUser Interfaces
- BComponents
- CObjects
- DElements
- A User interfaces
- BConnectivity
- CDatabases
- DDesign platform
- ABuild
- BExecution
- CInterpretation
- DCompilation
- Aplaceholder
- Belement history
- Ccomponent
- Dkey-value
- ATrue
- BFalse
- AEncryption
- BOptimization
- CModification
- DCompression
- Athis.state
- Bstate.current
- Cstate.current()
- Dthis.state()
- Athis.setState
- Bthis.updateState
- Cthis.alterState
- Dthis.state
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ReactJS - Basic - Quiz
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Time Taken: Questions: Answered: Not Answered:
Correct Answer:
Wrong Answer:
Percentage: %
- A. Virtual DOM
- B. DOM
- C. Elements
- D. Components
Remarks:
Explanation:
Is React really fast?
DOM
- Reading and writing is really slow in DOM.
- Changing the whole DOM each time when there is an update will slow down the page.
Virtual DOM
- Has rapid DOM rendering speed because manipulating the virtual DOM is much faster, because nothing gets drawn onscreen.
- Only the required part of DOM is updated.
What is exciting here?
For creating dynamic UI, DOM was never an optimized solution. Consider a page displaying a list containing 10 items and one is getting updated. While performing update, DOM will rebuild the entire list making it work 10 times more than what is necessary. This inefficiency can be overcome using Virtual DOM.
Virtual DOM is an abstract, lightweight copy of DOM. It can be changed as and when we want and then can be saved to the real DOM. Whenever a change occurs, Virtual DOM efficiently rerenders the DOM. It is much faster than DOM.
Virtual DOM (Document Object Model) has the same properties as a real DOM object.
React postulated the idea of Virtual DOM. It is commonly used in PayPal, Apple and Facebook.
- A. Control
- B. Model
- C. View
- D. All the options
Remarks:
Explanation: View
- A. User Interfaces
- B. Components
- C. Objects
- D. Elements
Remarks:
Explanation:
Components
React Features
Components– easier to maintain larger apps.JSX– an optional feature of React that is a JavaScript syntax extension.
But Still..
- React only covers view layer of the app, so you still need to choose other technologies to get a complete tooling set for development.
- React is using
inline templatingandJSXthat might be awkward to some developers.
- A. User interfaces
- B. Connectivity
- C. Databases
- D. Design platform
Remarks:
Explanation:
React is mainly for building User interfaces.
Need of React
Why ReactJS?
- Faster and better, thanks to Virtual DOM.
- Can be used on both Client side and server side. - If your app is more of dynamic data, you can go with client side scripting where you need not request the DOM for every change. - Static page can be rendered using server side scripts. - A good mixture of both helps maintain the page safe and efficient.
- Helps to maintain the readability of apps using components which is discussed later. - Can easily update the state by refering the components.
- A. Build
- B. Execution
- C. Interpretation
- D. Compilation
Remarks:
Explanation:
Compilation
React with JSX
Why JSX?
React uses JSX instead of the regular JavaScript.
Advantages:
- Faster because it performs optimization while compiling code to JavaScript.
- Type-safe and most of the errors can be caught during compilation.
- Easier and faster to write templates, if you are familiar with HTML.
- A. placeholder
- B. element history
- C. component
- D. key-value
Remarks:
Explanation:
key-value
States
State is an object that determines how the component renders and behaves. It is the place where the data comes from. It allows you to create components that are dynamic and interactive.
Statecan be defined as key-value pair defined in each component.- It can be -- Initialized with
this.state-- Updated on event calls. - When a component's state data changes, the
renderfunction will be called again to re-render the change in state usingthis.setState.
- A. True
- B. False
Remarks:
Explanation:
False
It is not mandatory to use JSX with React. But React would be elegant if JSX is used.
About JSX
JSXis aninline markupthat looks like HTML that gets transformed to JavaScript.- It starts with a HTML-like open tag, and ends with the corresponding closing tag.
Example:
<span class="pln"> </span><span class="kwd">const</span><span class="pln"> element </span><span class="pun">=</span><span class="pln"> </span><span class="str"><h1></span><span class="typ">Hello</span><span class="pun">,</span><span class="pln"> world</span><span class="pun">!</</span><span class="pln">h1</span><span class="pun">>;</span>
The syntax is intended to be used by preprocessors such as Babel to transform HTML-like text into standard JavaScript objects.
- A. Encryption
- B. Optimization
- C. Modification
- D. Compression
Remarks:
Explanation:
Optimization
React with JSX
Why JSX?
React uses JSX instead of the regular JavaScript.
Advantages:
- Faster because it performs optimization while compiling code to JavaScript.
- Type-safe and most of the errors can be caught during compilation.
- Easier and faster to write templates, if you are familiar with HTML.
- A. this.state
- B. state.current
- C. state.current()
- D. this.state()
Remarks:
Explanation:
this.state
States
State is an object that determines how the component renders and behaves. It is the place where the data comes from. It allows you to create components that are dynamic and interactive.
Statecan be defined as key-value pair defined in each component.- It can be -- Initialized with
this.state-- Updated on event calls. - When a component's state data changes, the
renderfunction will be called again to re-render the change in state usingthis.setState.
- A. this.setState
- B. this.updateState
- C. this.alterState
- D. this.state
Remarks:
Explanation:
this.setState
States
State is an object that determines how the component renders and behaves. It is the place where the data comes from. It allows you to create components that are dynamic and interactive.
Statecan be defined as key-value pair defined in each component.- It can be -- Initialized with
this.state-- Updated on event calls. - When a component's state data changes, the
renderfunction will be called again to re-render the change in state usingthis.setState.