Learnyounode

aggieTest.js

(function(){
    args = process.argv;
    args.shift();
    args.shift();
    var total = args.reduce(function(a,b){
        return parseInt(a,10) + parseInt(b,10);
    });
    console.log(total);
})()

blah.txt

filteredLs.js

var fs = require('fs');

var directory = process.argv[2],
    extension = process.argv[3];

//console.error(process.argv);

fs.readdir(directory, function(err, list) {
  if (err) {
    console.error(err);
    return;
  }
  list.filter(function(input){
    var reggie = new RegExp( ".*\\." + extension + "$", "g");
    return reggie.test(input);
  }).
    forEach(function(x){
    console.log(x)
  });
});

filteredLsModule.js

var fs = require('fs');
var path = require('path');

module.exports = function (dir, ext, charlie){

  fs.readdir(dir, function(err, list) {
    if (err) {
      charlie(err, null);
      return;
    }
  
  var lisa = list.filter(function(input){
      var paddy = path.extname(input);
      return paddy == ("." + ext);
      });

  charlie(null, lisa);
  });

};

filteredSolution.js

var fs = require('fs')
var path = require('path')

fs.readdir(process.argv[2], function (err, list) {
  list.forEach(function (file) {
    if (path.extname(file) === '.' + process.argv[3])
      console.log(file)
  })
})

ioAsync.js

var file = process.argv[2];
var fs = require('fs');
fs.readFile(file, function(err, data){
    if (err) throw err;
    console.log(data.toString().match(/\n/g).length);
});

ioPgm.js

var file = process.argv[2];
var fs = require('fs');
var doc = fs.readFileSync(file);
var x = doc.toString().match(/\n/g).length;
console.log(x);

moduleFilter.js

var filterFcn = require('./filteredLsModule');
filterFcn(process.argv[2], process.argv[3], function(err, list) {
	if (err) {
		console.error("This is the error: " + err);
	}

	list.forEach(function(argument) {
		console.log(argument);
	});
});

moduleTest1.js

var myTest = require('./moduleTest2');
myTest();

moduleTest2.js

module.exports = function(){
  console.log("Hello");
};

myProgram1.js

console.log("HELLO WORLD")