React Js Online Test

1. When the new state should completely replace the old state

2. When the new state depends on the old state

3. When the new state does not depend on the old state

Correct Answer : B

1. Keys

2. Props

3. Elements

4. Ref

Correct Answer : B

1. 1

2. 2

3. Multiple Elements

Correct Answer : C

1. React.mount()

2. ReactDOM.start()

3. ReactDOM.render()

4. React.render()

Correct Answer : C

1. To invoke code after the setState operation is done

2. To replace the state completely instead of the default merge action

3. To access the previous state before the setState operation

Correct Answer : A

1. Dispatcher->Action->Store->View

2. Action->Dispatcher->Store->View

3. Action->Store->Dispatcher->View

4. Action->Dispatcher->View->Store

Correct Answer : B

1. state & props

2. services & components

Correct Answer : A

1. Server side Framework

2. User-interface framework

3. A Library for building interaction interfaces

4. None of These

Correct Answer : C

1. style={{font-size:12,color:'red'}}

2. style={{fontSize:'12px',color:'red'}}

3. style={fontSize:'12px',color:'red'}

4. style={{font-size:12px,color:'red'}}

Correct Answer : B

1. Module

2. Component

3. Package

4. Class

Correct Answer : B

1. this.getState()

2. this.values

3. this.prototype.stateValue

4. this.state

Correct Answer : B

1. Do not requires to be unique

2. Unique in the DOM

3. Unique among the siblings only

4. All of the above

Correct Answer : C

1. Methods

2. Injected

3. Both 1 & 2

Correct Answer : A

1. Original DOM

2. Virtual DOM

3. Both 1 & 2

4. None of above

Correct Answer : B

1. willComponentUpdate

2. shouldComponentUpdate

3. componentDidUpdate

4. componentDidMount

Correct Answer : B

1. props

2. renderComponent

3. state

4. render

Correct Answer : C

1. Transpiles all the Javascript down into one file

2. Runs react local development server.

3. A module bundler

Correct Answer : C

1. Yes

2. No

Correct Answer : A

1. Using the reduce array method

2. With a for/while loop

3. Using the <Each /> component

4. Using the Array.map() method

Correct Answer : D

1. componentDidUpdate

2. componentDidMount

3. componentMounted

4. componentUpdated

Correct Answer : B

1. setState

2. render with arguments

3. props

4. PropTypes

Correct Answer : C

1. one way data flow

2. Two way data flow

3. No one

Correct Answer : A

1. Flux

2. JSX

3. Dom

4. Props

Correct Answer : A

1. Mounting, Updating

2. Mounting, Unmounting

3. Mounting, Updating, Unmounting

4. None of these

Correct Answer : C

1. this.setState

2. this.changeState

3. this.State = {}

Correct Answer : A

1. getInitialState, componentWillMount

2. Mounting, Unmounting

3. Before, After

4. Will, Did

Correct Answer : D

1. Repetitive output appears on the screen

2. Stack overflow error

3. Duplicate key error

4. Nothing happens. Life goes on!

Correct Answer : B

1. It will be rendered as enabled

2. It will be rendered as disabled

3. It will not be rendered at all

Correct Answer : A

1. setInitialnumber

2. setState

3. setnumber

4. setNewnumber

Correct Answer : B

1. getWillState

2. getInitialState

3. getPropsValue

4. getDefaultProps

Correct Answer : D