Javascript concepts to master before learning ReactJS

[charlesprabhu]

- arrow function
- array methods
- normal functions
- spread operators
- function expressions
- default imports
- handling events
- lexical scoping
- String Methods
- named imports
- async await
- destructuring
- map
- filter
- reduce
- loops
- promises
- callbacks
- variables
- scopes
- working with objects
- asynchronous JS