React Js Online Test

1. Module

2. Component

3. Package

4. Class

Correct Answer : B

1. Yes

2. No

Correct Answer : A

1. componentDidUpdate

2. componentDidMount

3. componentMounted

4. componentUpdated

Correct Answer : B

1. willComponentUpdate

2. shouldComponentUpdate

3. componentDidUpdate

4. componentDidMount

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. Keys

2. Props

3. Elements

4. Ref

Correct Answer : B

1. Update a react app

2. Creates new react app

3. install dependencies

Correct Answer : B

1. A transpiler

2. An interpreter

3. A Compiler

4. Both Compiler and Transpilar

Correct Answer : D

1. componentWillReceiveProps

2. shouldComponentUpdate

3. componentWillMount

4. componentDidMount

Correct Answer : C

1. this.setState

2. this.changeState

3. this.State = {}

Correct Answer : A

1. state & props

2. services & components

Correct Answer : A

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. props

2. renderComponent

3. state

4. render

Correct Answer : C

1. React.mount()

2. ReactDOM.start()

3. ReactDOM.render()

4. React.render()

Correct Answer : C

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. 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. Original DOM

2. Virtual DOM

3. Both 1 & 2

4. None of above

Correct Answer : B

1. this.getState()

2. this.values

3. this.prototype.stateValue

4. this.state

Correct Answer : B

1. 1

2. 2

3. Multiple Elements

Correct Answer : C

1. Server side Framework

2. User-interface framework

3. A Library for building interaction interfaces

4. None of These

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. getWillState

2. getInitialState

3. getPropsValue

4. getDefaultProps

Correct Answer : D

1. setState

2. render with arguments

3. props

4. PropTypes

Correct Answer : C

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. getInitialState, componentWillMount

2. Mounting, Unmounting

3. Before, After

4. Will, Did

Correct Answer : D

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

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

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

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

Correct Answer : A

1. one way data flow

2. Two way data flow

3. No one

Correct Answer : A

1. Mounting, Updating

2. Mounting, Unmounting

3. Mounting, Updating, Unmounting

4. None of these

Correct Answer : C

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