React Js Online Test

1. A transpiler

2. An interpreter

3. A Compiler

4. Both Compiler and Transpilar

Correct Answer : D

1. Server side Framework

2. User-interface framework

3. A Library for building interaction interfaces

4. None of These

Correct Answer : C

1. getInitialState, componentWillMount

2. Mounting, Unmounting

3. Before, After

4. Will, Did

Correct Answer : D

1. this.getState()

2. this.values

3. this.prototype.stateValue

4. this.state

Correct Answer : B

1. Yes

2. No

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. 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. componentWillReceiveProps

2. shouldComponentUpdate

3. componentWillMount

4. componentDidMount

Correct Answer : C

1. state & props

2. services & components

Correct Answer : A

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. willComponentUpdate

2. shouldComponentUpdate

3. componentDidUpdate

4. componentDidMount

Correct Answer : B

1. Methods

2. Injected

3. Both 1 & 2

Correct Answer : A

1. one way data flow

2. Two way data flow

3. No one

Correct Answer : A

1. Update a react app

2. Creates new react app

3. install dependencies

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. React.mount()

2. ReactDOM.start()

3. ReactDOM.render()

4. React.render()

Correct Answer : C

1. Original DOM

2. Virtual DOM

3. Both 1 & 2

4. None of above

Correct Answer : B

1. Keys

2. Props

3. Elements

4. Ref

Correct Answer : B

1. Module

2. Component

3. Package

4. Class

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. setState

2. render with arguments

3. props

4. PropTypes

Correct Answer : C

1. Mounting, Updating

2. Mounting, Unmounting

3. Mounting, Updating, Unmounting

4. None of these

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. componentDidUpdate

2. componentDidMount

3. componentMounted

4. componentUpdated

Correct Answer : B

1. Flux

2. JSX

3. Dom

4. Props

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. <

2. ->

3. >

4. =>

Correct Answer : D

1. A persistent storage.

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

Correct Answer : B

1. getWillState

2. getInitialState

3. getPropsValue

4. getDefaultProps

Correct Answer : D

1. Inside js/components/

2. Inside vendor/components/

3. Inside external/components/

4. Inside vendor/

Correct Answer : A