node.js: readline.clearLine(stream, dir)

readline.clearLine(stream, dir)

method clears current line of given TTY stream in a specified direction identified by dir.

Argument ‘dir’ represents the direction.

dir value	Description
-1	to the left from cursor
1	to the right from cursor
0	the entire line

Find the below working application.

HelloWorld.js

/* Import readline module */
var readline = require('readline');

var interval_time_out = 500;
var total_interval_time = 0;

var rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout
});

readline.cursorTo(process.stdout, 0, 0)
readline.clearScreenDown(process.stdout);

/* Repeat this function for every 500 milliseconds */
var intervalRef = setInterval(function(){
 readline.clearLine(process.stdout, 0);
 readline.cursorTo(process.stdout, 0, 0);
 
 total_interval_time += interval_time_out;
 
 rl.write("Total time : " + total_interval_time);

}, interval_time_out);

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