React: Now a days react is the most popular javascript library which is used to build user interfaces specially for single page application. by react we can make large web application and we can change the route of that application without reloading the hole application. why react is called react: …

js event loop: The event loop is the secret behind javascript asynchronous programming.javascript executes all operations on a single thread, but using a few smart data structures, it gives us the illusion of multi-threading. … Based on the command received from the call stack, the API starts its own single-threaded…

function: to create a function first we have to declare “function” keyword then we gave a function name then we gave one or more parameter as we need if we don’t need any parameter we can keep it empty then then we declare its body by {}. …