React Js Online Test

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. Methods

2. Injected

3. Both 1 & 2

Correct Answer : A

1. A transpiler

2. An interpreter

3. A Compiler

4. Both Compiler and Transpilar

Correct Answer : D

1. <

2. ->

3. >

4. =>

Correct Answer : D

1. Inside js/components/

2. Inside vendor/components/

3. Inside external/components/

4. Inside vendor/

Correct Answer : A

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. state & props

2. services & components

Correct Answer : A

1. getWillState

2. getInitialState

3. getPropsValue

4. getDefaultProps

Correct Answer : D

1. Update a react app

2. Creates new react app

3. install dependencies

Correct Answer : B

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. Flux

2. JSX

3. Dom

4. Props

Correct Answer : A

1. A persistent storage.

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

Correct Answer : B

1. getInitialState, componentWillMount

2. Mounting, Unmounting

3. Before, After

4. Will, Did

Correct Answer : D

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. Module

2. Component

3. Package

4. Class

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. 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. Yes

2. No

Correct Answer : A

1. setState

2. render with arguments

3. props

4. PropTypes

Correct Answer : C

1. <h1>{fetch()}</h1>

2. <h1>${fetch()}</h1>

3. <h1>{fetch}</h1>

4. <h1>${fetch}</h1>

Correct Answer : A

1. Original DOM

2. Virtual DOM

3. Both 1 & 2

4. None of above

Correct Answer : B

1. Server side Framework

2. User-interface framework

3. A Library for building interaction interfaces

4. None of These

Correct Answer : C

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

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

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

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

Correct Answer : D

1. willComponentUpdate

2. shouldComponentUpdate

3. componentDidUpdate

4. componentDidMount

Correct Answer : B

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. props

2. renderComponent

3. state

4. render

Correct Answer : C

1. Props

2. State

3. RenderComponent

4. Render

Correct Answer : D

1. componentWillReceiveProps

2. shouldComponentUpdate

3. componentWillMount

4. componentDidMount

Correct Answer : C

1. componentDidUpdate

2. componentDidMount

3. componentMounted

4. componentUpdated

Correct Answer : B

1. Mounting, Updating

2. Mounting, Unmounting

3. Mounting, Updating, Unmounting

4. None of these

Correct Answer : C