Jhon Quintero mr-sudaca

true and false vs. "truthy" and "falsey" (or "falsy") in Ruby, Python, and JavaScript

Many programming languages, including Ruby, have native boolean (true and false) data types. In Ruby they're called true and false. In Python, for example, they're written as True and False. But oftentimes we want to use a non-boolean value (integers, strings, arrays, etc.) in a boolean context (if statement, &&, ||, etc.).

This outlines how this works in Ruby, with some basic examples from Python and JavaScript, too. The idea is much more general than any of these specific languages, though. It's really a question of how the people designing a programming language wants booleans and conditionals to work.

If you want to use or share this material, please see the license file, below.

Update

Open all files with git merge conflicts in MacVim

git diff --name-only | uniq | xargs mvim

When git encounters a merge conflict, e.g. during a rebase, it drops you back into the shell with a dirty working directory. I like this one-liner for opening all files with a merge conflict in MacVim.

Once you're in Vim, you can then switch between the files with :n and :prev, or another favourite: :w | n (save current file and open the next command line-supplied file).

UPDATE: see below for a version that works with real terminal commands.

VPS cheaper than 5 €/month

Famous/big companies

Linode

Current status (October 2020): better avoid

Starting from 5 $/month.

Update!

This gist is out of date and I can no longer help much, as I got rid of my Mac.

Please visit T2 Linux website for more and better information:

https://t2linux.org/

Acknowledgements

This gist is just a compilation of the hard work that others have put in. I'm not a software developer, so if there are any mistakes or better ways of doing things, I'd appreciate any suggestions. Here's a list of the real heroes who made this possible:

	#!/usr/bin/env ruby
	# vim: set syntax=ruby

	flag = false

	staged_files = `git diff --cached --name-only`.split

	ruby_files = staged_files.select{\|s\| s =~ /\.rb$/}

	ruby_files.each do \|file\|

	# This is the complete source code to Basic Gorillas:
	# https://dragonruby.itch.io/basicgorillas
	#
	# You can tinker with this by getting a copy of DragonRuby Game Toolkit:
	# https://dragonruby.org/
	#
	# Amir Rajan wrote this game, catch him at https://twitter.com/amirrajan !

	class YouSoBasicGorillas
	attr_accessor :outputs, :grid, :game, :inputs