Exercises

JS(ES6)

What is an arrow function? What are all its uses? How it differs from a normal function?

It is called also a anonymous function, is scoped to global and they're non constructible.

What is an generator function?

It is a function that returns a generator and its context will be conserved in every call.

What is hoisting in JS?

It is a concept to explain how work the execution context, for example in compilation the variable declarations run firts, so you can use a varible that is declared later in the code.

What is a callback hell?

It is a term that refers to the use of a callback inside another, over and over again.

What is an event loop?

It is how the execution of calls works, first, every call is stored in call stack, when it is finished the next call will be executed until the stack is empty.

React JS

What is ReactDOM and what is the difference between ReactDOM and React?

React is the JS library to build interfaces and the ReactDOM is the virtual DOM that React uses to know what element will be rendered in the UI.

What are the differences between a class component and functional component?

Class components extends the class Component from React that runs the render method and functional components is just a function that return JSX code.

What is the difference between state and props?

State are initialized in the component and props are inherited from parent component both are data for manage the component.