gtkatakura

// library or otherwise
// {

type Func<T, TResult> = (value: T) => TResult;
type Predicate<T> = Func<T, boolean>;

function compose<TIn, TMiddle, TOut>(f: Func<TMiddle, TOut>, g: Func<TIn, TMiddle>) {
  return (value: TIn) => f(g(value));
}

rauschma

Advantages compared to using symbols as enum values:

• Enum values are much more customizable. For example, one can have custom prototype and/or instance methods.
• Enum values get two custom properties:
  • name provides direct access to the name of an enum value.
  • ordinal holds a number, the position of the enum value. Useful for some applications.
• One can use instanceof to test whether a value is an element of an enum.
• One occasionally requested feature for enums is that enum values be numbers (e.g. for flags) or strings (e.g. to compare with values in HTTP headers). That can be achieved by making those values properties of enum values. For an example, see enum Mode, below.

Static properties of enums:

remojansen

function logClass(target: any) {
 
  // save a reference to the original constructor
  var original = target;
 
  // a utility function to generate instances of a class
  function construct(constructor, args) {
    var c : any = function () {
      return constructor.apply(this, args);
    }

branneman

Better local require() paths for Node.js

Problem

When the directory structure of your Node.js application (not library!) has some depth, you end up with a lot of annoying relative paths in your require calls like:

const Article = require('../../../../app/models/article');

Those suck for maintenance and they're ugly.

Possible solutions

cerebrl

tl;dr

1. Don't run as root.
2. For sessions, set httpOnly (and secure to true if running over SSL) when setting cookies.
3. Use the Helmet for secure headers: https://github.com/evilpacket/helmet
4. Enable csrf for preventing Cross-Site Request Forgery: http://expressjs.com/api.html#csrf
5. Don't use the deprecated bodyParser() and only use multipart explicitly. To avoid multiparts vulnerability to 'temp file' bloat, use the defer property and pipe() the multipart upload stream to the intended destination.

mathewbyrne

function slugify(text)
{
  return text.toString().toLowerCase()
    .replace(/\s+/g, '-')           // Replace spaces with -
    .replace(/[^\w\-]+/g, '')       // Remove all non-word chars
    .replace(/\-\-+/g, '-')         // Replace multiple - with single -
    .replace(/^-+/, '')             // Trim - from start of text
    .replace(/-+$/, '');            // Trim - from end of text
}