joepie91

someObject = instantiateSomePersistentObjectSomehow();

app.use(function(req, res, next) {
	req.someObject = someObject;
	next();
});

// ...

app.get("/sample/route", function(req, res) {

joepie91

console.log("Before the first file is read.");
hypotheticalFileGetContents("sample.txt", function(fileContents){
	// fileContents now contains the file contents, this function is only called when the file read in the background has finished
	console.log("After the first file has completed reading.");
});

// You've now told it to start the first read, but it won't 'block' your script execution. It will do the read in the background, and immediately move on with the rest of your code.

console.log("Before the second file is read.");
hypotheticalFileGetContents("sample2.txt", function(fileContents){

joepie91

functionCreator = function(favouriteNumber) {
	return function(inputNumber) {  // <-- This function is a closure!
		console.log("You input the number " + inputNumber + ", and your favourite number is " + favouriteNumber + ".");
		
		if(inputNumber === favouriteNumber) {
			console.log("Those are the same number!");
		} else {
			console.log("Those are NOT the same number!");
		}
	}

joepie91

exports.convertXLSXToJSON2 = function(req, res) {
    var path = fileServerPath + req.body.name;
    console.log("starting..." + path);
    var exists = fs.existsSync(path);
    console.log("path exists? " + exists);
    console.log("in xlsx to json 2 method...starting conversion");
    try {
        var obj = asyncXLSX.parse(path);
        console.log("obj: " + obj);
        res.send(obj);

joepie91

/* Based on https://gist.github.com/spelufo/10872517 */

var gulp = require('gulp');
var child = require('child_process');
var childProcesses = {};

var jade = require("gulp-jade");

/* CoffeeScript compile deps */
var gutil = require('gulp-util');

joepie91

In response to http://www.jongleberry.com/why-i-hate-npm.html. Some valid points raised, but lost in a sea of nonsense.

Downtime and errors

• Haven't experienced this. At all.

Slow

• npm is the fastest package manager I've ever personally used. I'm not aware of any consistently faster ones.
• How long npm install takes for an already installed application is not a relevant metric - that's not a real-world scenario.
• Component, by its own admission, downloads selectively. Of course it will be faster. Does he have any explanation as to why Component is faster?

joepie91

db = getDatabaseConnectionSomehow();

app.use(function(req, res, next){
	req.db = db;
	next();
});

// [...]

app.get("/", function(req, res) {

joepie91

module.exports = function(configuration) {
	var configuredInstance = createInstance(configuration);
	
	return function(argOne, argTwo) {
		configuredInstance.doThing(argOne)
		return configuredInstance.doAnotherThing(argTwo);
	}
}

joepie91

listOfNumbers = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10];

newList = listOfNumbers.filter(function(number) {
	return (number <= 5);
});

console.log(newList); // [ 0, 1, 2, 3, 4, 5 ]

joepie91

/* UPDATED: This example has been changed to use the new object predicates, that were
 * introduced in Bluebird 3.0. If you are using Bluebird 2.x, you will need to use the
 * older example below, with the predicate function. */

var Promise = require("bluebird");
var fs = Promise.promisifyAll(require("fs"));

Promise.try(function(){
	return fs.readFileAsync("./config.json").then(JSON.parse);
}).catch({code: "ENOENT"}, function(err){