mikaelbr

// Doesn't throw an error, but doesn't return an object
const getObj = () => { a: 1 };
console.log(getObj()); //=> val 'undefined' : void

// Reason: It looks lika an arrow function returning an object, but it isn't.
//         It's an arrow function with statements returning nothing.
const getObj = () =>
{    // <- Start function body
  a: // <- Statement 1: A label to use when break/continue; e.g. break a;
  1  // <- Statement 2: Just a noop expression statement, not doing anything.

buzzdecafe

CATEGORY THEORY FOR PROGRAMMERS

Category Theory 1.1: Motivation and Philosophy 
https://www.youtube.com/watch?v=I8LbkfSSR58&index=1&list=PLbgaMIhjbmEnaH_LTkxLI7FMa2HsnawM_

Composability, Abstraction, Reusability

Category Theory is a higher-level language.
Not a practical, executable language.

holgerschurig

#!/bin/sh

# Step 1: clone projects into directories with a leading "git-":
#
#     git clone http://foo.org/foo.git git-foo
#     git clone http://bar.org/bar.git git-bar
#
# Step 2: some hours/days/weeks later, run this script:
#
#     ./update.sh

SOLenG

// λx.λy.y  fun x -> fun y -> y
var False = function (x) {
    return function (y) {
        return y;
    };
};
// λx.λy.x
var True = function (x) {
    return function (y) {
        return x;

andymatuschak

A composable pattern for pure state machines with effects

State machines are everywhere in interactive systems, but they're rarely defined clearly and explicitly. Given some big blob of code including implicit state machines, which transitions are possible and under what conditions? What effects take place on what transitions?

There are existing design patterns for state machines, but all the patterns I've seen complect side effects with the structure of the state machine itself. Instances of these patterns are difficult to test without mocking, and they end up with more dependencies. Worse, the classic patterns compose poorly: hierarchical state machines are typically not straightforward extensions. The functional programming world has solutions, but they don't transpose neatly enough to be broadly usable in mainstream languages.

Here I present a composable pattern for pure state machiness with effects,

lena121

QUICK SHORTCODES:

Ctrl+T        find all files with similar typing file's name in all project
Ctrl+\        hide or open tree view
Ctrl+Shift+F  find something in all project
Ctrl+/        comment single line or comment selected piece of code
Ctrl+cursor   get multi select (coursor)
Ctrl+W        close all pannels in editor
Ctrl+Shift+P - command line

torgeir

const declare = function (dispatch, state) {
  
  const view = function () {
    if (state.error) {
      return <p>Error: { state.error }</p>;
    }
    
    if (state.loading) {
      return <p>Clock: Loading..</p>;
    }

mikaelbr

const fib = multiMethod();
fib[0] = 0;
fib[n => n <= 1] = 1;
fib[_ => true] = (n) => fib(n-1) + fib(n-2);
console.log(fib(20));
//=> 6765

function multiMethod () {
  let predicates = [];
  const handler = {

toddmotto

Component versus Directive in AngularJS

.component()

Components are not "helper" methods, they are the best change in Angular 1.x since I've been using it.

What is the role of .component()?

• Declares new HTML via a template or templateUrl
• Should be used to create Components as part of a Component architecture

uglow

AngularJS Directive Attribute Binding Explanation

When using directives, you often need to pass parameters to the directive. This can be done in several ways. The first 3 can be used whether scope is true or false. This is still a WIP, so validate for yourself.

1. Raw Attribute Strings

   <div my-directive="some string" another-param="another string"></div>