ASCII charts in the command line with Node.js

ascii-chart.js

// http://www.tldp.org/HOWTO/Bash-Prompt-HOWTO/x361.html
var chart = require('ascii-chart'),
  _ = require('lodash');

var data = [];

var out = process.stdout;

out.write('\033[2J'); // clear the screen

setInterval(function () {
  var datum = _.random(0, 100);
  data.push(datum);
  data = _.last(data, 40);
  out.write('\033[0;0H'); // set the cursor to 0;0
  datum = (datum < 10) ? '  ' + datum : (datum < 99) ? ' ' + datum : datum;
  console.log('Current: ' + datum);
  out.write(chart(data, {
    width: 80,
    height: 20
  }));
}, 1000);