Tadas Tamošauskas tadast

CoffeeScript 1.7 is shaping up to be a pretty kick-ass release with significant improvements. Here are the ones I'm most excited about, in order of my own excitement.

Parentheses-free chaining

jashkenas/coffeescript#3263

Years of being wished for, finally granted!

This document has moved!

It's now here, in The Programmer's Compendium. The content is the same as before, but being part of the compendium means that it's actively maintained.

How to set up a basic Sinatra + React webapp in 2025

Let's say you want to use Ruby for the backend of a basic webapp but React on the frontend. Here's how.

(Note: All tested on January 13, 2025 with Ruby 3.3, Sinatra 4.1.1, and React 18.3. Configs may change over time.)

First, create the app folder and set up Sinatra:

mkdir my-sinatra-react-app

	# Given an array of arrays s = [ [1,2,3], [4,5,6], ... ]
	# compute the Cartesian product among the elements of s.

	require 'pp'

	s = [[1, 2], [3, 4, 5], [6, 7, 8, 9]]
	pp s[1..-1].inject(s[0]){ \|m,v\| m = m.product(v).map(&:flatten) }
	[[1, 3, 6],
	[1, 3, 7],
	[1, 3, 8],

	Ruby 2.1.0 in Production: known bugs and patches

	Last week, we upgraded the github.com rails app to ruby 2.1.0 in production.
	While testing the new build for rollout, we ran into a number of bugs. Most of
	these have been fixed on trunk already, but I've documented them below to help
	anyone else who might be testing ruby 2.1 in production.

	@naruse I think we should backport these patches to the ruby_2_1 branch and
	release 2.1.1 sooner rather than later, as some of the bugs are quite critical.
	I'm happy to offer any assistance I can to expedite this process.

	require 'stringio'
	require 'timeout'

	class Object
	def methods_returning(expected, *args, &blk)
	old_stdout = $>
	$> = StringIO.new

	methods.select do \|meth\|
	Timeout::timeout(1) { dup.public_send(meth, *args, &blk) == expected rescue false } rescue false

	public class Perlin {

	public int repeat;

	public Perlin(int repeat = -1) {
	this.repeat = repeat;
	}

	public double OctavePerlin(double x, double y, double z, int octaves, double persistence) {
	double total = 0;

	require "net/http"

	def start_server
	# Remove the X to enable the parameters for tuning.
	# These are the default values as of Ruby 2.2.0.
	@child = spawn(<<-EOC.split.join(" "))
	XRUBY_GC_HEAP_FREE_SLOTS=4096
	XRUBY_GC_HEAP_INIT_SLOTS=10000
	XRUBY_GC_HEAP_GROWTH_FACTOR=1.8
	XRUBY_GC_HEAP_GROWTH_MAX_SLOTS=0

	name: CI

	on: [push]

	jobs:
	test:
	runs-on: ubuntu-latest
	container:
	image: ruby:2.6.5