REPL in Nodejs | Read-Eval-Print-Loop in Node

 

==>Node.js comes with a virtual environment called REPL (aka Node shell). Node REPL stands for Read-Eval-Print-Loop. It is a quick and easy way to test simple Node.js/JavaScript code.

==>The following table lists important REPL commands.

REPL Command	Description
.help	Display help on all the commands
tab Keys	Display the list of all commands.
Up/Down Keys	See previous commands applied in REPL.
.save filename	Save current Node REPL session to a file.
.load filename	Load the specified file in the current Node REPL session.
ctrl + c	Terminate the current command.
ctrl + c (twice)	Exit from the REPL.
ctrl + d	Exit from the REPL.
.break	Exit from multiline expression.
.clear	Exit from multiline expression.

Async/await:- 

=> Async/await is a new way to write asynchronous code. Previous options for asynchronous code are callbacks and promises.

=> Async/await is actually built on top of promises. It cannot be used with plain callbacks or node callbacks.

=> Async/await is, like promises, nonblocking.

=> Async/await makes asynchronous code look and behave a little more like synchronous code. This is where all its power lies.