React

Question 1

How should a component update its props?

Answer 1

Never directly. A change handler function should be passed down through props.

Question 2

What does the effect hook replace?

Answer 2

Component lifecycle methods

mounting
updating
unmounting

Question 3

This is a syntax extension for JavaScript to allow HTML in the form of expressions

Answer 3

JSX

Question 4

HTML or JSX attributes which trigger a function upon a certain action

Answer 4

Event listeners

Examples
onClick
onChange

Question 5

Does JS logic belong inside or above a component’s return statement?

Answer 5

Above

Question 6

A component returned inside another component

Answer 6

Instance

Question 7

What is the meat of an open component instance called and how is it rendered inside?

Answer 7

const ChildComponent = (props) => {
return (
{ props.children }
)
}

Question 8

How do you assign .defaultProps?

Answer 8

After the function component:

ComponentName.defaultProps = {
property: value
}

Question 9

This hook replaces the getter and setter methods for state in a functional component

Answer 9

useState()

Question 10

A function called inside of another function

Answer 10

Callback Function

Question 11

Higher Order Function

Answer 11

Takes a callback function as argument

eg. arr.map(num => num * 2)

.map is a higher order function