Herve07h22

import { useEffect, useState } from "react";

class EventBus<T> {
  _handlers: Set<(t: T) => void> = new Set();
  subscribe(handler: (t: T) => void) {
    this._handlers.add(handler);
  }
  unsubscribe(handler: (t: T) => void) {
    this._handlers.delete(handler);
  }

progapandist

Fixing Webpacker 3.3.0 + Rails 5.1.5

Heroku hosting trouble

Heroku may not detect a correct buildpack for your JS dependencies, then you have to set it manually:

heroku buildpacks:add heroku/nodejs -i 1
heroku buildpacks:add --index 2 https://github.com/heroku/heroku-buildpack-ruby

progapandist

Plugging a Datepicker

Let's put an end to datepicker suffering! Follow this steps to have your shiny new datepicker working in no time! (and remind yourselves of JS plugins in Rails)

Note: We recommend using Bootstrap Datepicker (try your own luck with anything different and remember, jQuery-UI's datepicker sucks, don't use it). These are the only three links you need:

1. Docs
2. Demo. Where you can play with different settings.

samueljseay

// default exports
export default 42;
export default {};
export default [];
export default (1 + 2);
export default foo;
export default function () {}
export default class {}
export default function foo () {}

devillecodes

build:
  steps:
    - script:
      name: install yarn
      code: npm install -g yarn
    - script:
      name: report yarn version
      code: yarn --version
    - script:
      name: set yarn cache

olivierlacan

This guide assumes that you recently run brew upgrade postgresql and discovered to your dismay that you accidentally bumped from one major version to another: say 9.3.x to 9.4.x. Yes, that is a major version bump in PG land.

First let's check something.

brew info postgresql

The top of what gets printed as a result is the most important:

Vestride

Encoding Video

Installing

Install FFmpeg with homebrew. You'll need to install it with a couple flags for webm and the AAC audio codec.

brew install ffmpeg --with-libvpx --with-libvorbis --with-fdk-aac --with-opus

henrik

module ImagesHelper
  # Example usage:
  #
  #   image_set_tag_3x "foo_1x.png", alt: "foo"
  #
  # Will assume there is a 2x and 3x version and provide those automagically.
  #
  # Based on https://gist.github.com/mrreynolds/4fc71c8d09646567111f
  def image_set_tag_3x(source, options = {})
    srcset = [ 2, 3 ].map { |num|

iamnewton

Regular Colors

Value	Color
\e[0;30m	Black
\e[0;31m	Red
\e[0;32m	Green
\e[0;33m	Yellow
\e[0;34m	Blue
\e[0;35m	Purple

zhengjia

=Navigating=
    visit('/projects')
    visit(post_comments_path(post))

=Clicking links and buttons=
    click_link('id-of-link')
    click_link('Link Text')
    click_button('Save')
    click('Link Text') # Click either a link or a button
    click('Button Value')