node.js console app for generating pyramid.

pyramid.js

var readline = require('readline');

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

rl.question("What's the pyramid size? ", function(answer) {
  var size = parseInt(answer);
  var tmpString = "";
  if (size) {
	  for (var i = size, s = 1; i > 0; i--, s+=2) {
	  	tmpString = "";
	  	tmpString = new Array(i).join(" ");
	  	tmpString += s == 1 ? 'x' : new Array(s+1).join("x");	
	  	console.log(tmpString);
	  }
  } else {
  	console.log("Warning: pyramid size should be an Int.");
  }

  rl.close();
});