What is differences and similarties ?

Similarities

2. Solve Same Problem of react js Component Render Functions

3. Prevent Unnecessary Render Component

4. Same used Shallow Comparation of Object

5. Both Focus on Performence Optimization

Differences

useMemo Hook	PureComponent
useMemo used in functional compoment	PureComponent is used class componenrt
Use useMemo Hook	ReactJS Pure Components
const cachedValue = useMemo(<calculateValue>, <dependencies>)	export default class Test extends React.PureComponent
There is choice for memoizations particular state and props fields through 'dependencies' parameter	There is no choice for memoizations particular state and props field