# READLINES-SYNC IN NODE JS


As my first nodejs program, i had to make a cli quiz app which includes taking the input from the user . As there are many input methods, i used readline-sync .
## ReadlineSync in node
Synchronous Readline for interactively running to have a conversation with the user via a console(TTY).
readlineSync tries to let your script have a conversation with the user via a console, even when the input/output stream is redirected like your-script <foo.dat >bar.log.
A simple readlineSync code snippet will look like this



```var readlineSync = require('readline-sync');
// Wait for user's response.
var userName = readlineSync.question('May I have your name? ');
console.log('Hi ' + userName + '!');```


Above code snippet will simply ask for the user name as the input which will be stored in userName variable. For the input,it will display the 'May I have your name? ' as a message on the console and then the user will input the value as his/her name.
Then console will display a welcome message along with username that the user entered.

> May I have your name? CookieMonster
Hi CookieMonster!


the console will look like this after executing the above snippet. Here "CookieMonster" is the name/input entered and look how input is taken along with displaying the message"May I have your name?".

readline sync for displaying a list:

```var readlineSync = require('readline-sync'),
  animals = ['Lion', 'Elephant', 'Crocodile', 'Giraffe', 'Hippo'],
  index = readlineSync.keyInSelect(animals, 'Which animal?');
console.log('Ok, ' + animals[index] + ' goes to your room.');
``` 

this will generate the below output in the console:
>[1] Lion
[2] Elephant
[3] Crocodile
[4] Giraffe
[5] Hippo
[0] CANCEL
 
>Which animal? [1...5 / 0]: 2
>Ok, Elephant goes to your room.