React Js Online Test

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. setInitialnumber

2. setState

3. setnumber

4. setNewnumber

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. componentWillReceiveProps

2. shouldComponentUpdate

3. componentWillMount

4. componentDidMount

Correct Answer : C

1. <

2. ->

3. >

4. =>

Correct Answer : D

1. Keys

2. Props

3. Elements

4. Ref

Correct Answer : B

1. this.getState()

2. this.values

3. this.prototype.stateValue

4. this.state

Correct Answer : B

1. getWillState

2. getInitialState

3. getPropsValue

4. getDefaultProps

Correct Answer : D

1. Methods

2. Injected

3. Both 1 & 2

Correct Answer : A

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. Original DOM

2. Virtual DOM

3. Both 1 & 2

4. None of above

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. Server side Framework

2. User-interface framework

3. A Library for building interaction interfaces

4. None of These

Correct Answer : C

1. Yes

2. No

Correct Answer : A

1. componentDidUpdate

2. componentDidMount

3. componentMounted

4. componentUpdated

Correct Answer : B

1. one way data flow

2. Two way data flow

3. No one

Correct Answer : A

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. <button onclick={this.foo()}>

2. <button onclick={this.foo}>

3. <button onClick={this.foo()}>

4. <button onClick={this.foo}>

Correct Answer : D

1. A transpiler

2. An interpreter

3. A Compiler

4. Both Compiler and Transpilar

Correct Answer : D

1. props

2. renderComponent

3. state

4. render

Correct Answer : C

1. A persistent storage.

2. An internal data store (object) of a component.

Correct Answer : B

1. Transpiles all the Javascript down into one file

2. Runs react local development server.

3. A module bundler

Correct Answer : C

1. setState

2. render with arguments

3. props

4. PropTypes

Correct Answer : C

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. Module

2. Component

3. Package

4. Class

Correct Answer : B

1. An input element with the controlled flag

2. An input element whose value is being controlled by a component’s state

3. An input element that can only accept a list of characters

4. An input element that is controlled by the value of another input element

Correct Answer : B

1. getInitialState, componentWillMount

2. Mounting, Unmounting

3. Before, After

4. Will, Did

Correct Answer : D

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