Q.Lifecycle methods are mainly used

• to enhance components
• To keep track of event history
• freeup resources

Q.Event handling in React is more similar to Event handling in DOM.

• False
• True

Q.In React state can be accessed using ________.

• this.state
• this.state()
• state.current()
• None of these

Q.React keeps track of what items have changed, been added, or been removed from a list using ________.

• props
• state
• ref
• keys

Q.Which lifecycle event is invoked before rendering and when new props or state are being received?

• shouldComponentUpdate()
• render()
• Updaterender()

Q.We can declare special methods on the component class to run some code when a component mounts and unmounts.

• False
• True

Q.Two building blocks of ReactJS are ______________.

• Components and Elements
• Keys and Lists
• Props and State

Q.React covers __________ layer of the app.

• Control
• View
• Model

Q.Function that does not change its results for the same set of inputs are called __________.

• Impure Function
• Pure Function

Q.React uses _____________ syntax.

• LowerCase
• UpperCase
• CamelCase