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@JamieMason
JamieMason / group-objects-by-property.md
Created September 14, 2018 07:38
Group Array of JavaScript Objects by Key or Property Value

Group Array of JavaScript Objects by Key or Property Value

Implementation

const groupBy = key => array =>
  array.reduce((objectsByKeyValue, obj) => {
    const value = obj[key];
    objectsByKeyValue[value] = (objectsByKeyValue[value] || []).concat(obj);
    return objectsByKeyValue;
@fphilipe
fphilipe / exclude.sql
Last active September 14, 2024 13:46
PostgreSQL EXCLUDE constraint
CREATE EXTENSION btree_gist;
CREATE TABLE room_reservations (
room_id integer,
reserved_at timestamptz,
reserved_until timestamptz,
canceled boolean DEFAULT false,
EXCLUDE USING gist (
room_id WITH =, tstzrange(reserved_at, reserved_until) WITH &&
) WHERE (not canceled)
@oshybystyi
oshybystyi / random-emoji.zsh-theme
Last active April 23, 2023 06:13 — forked from audy/prompt.sh
# zsh
EMOJI=(💩 🐦 🚀 🐞 🎨 🍕 🐭 👽 ☕️ 🔬 💀 🐷 🐼 🐶 🐸 🐧 🐳 🍔 🍣 🍻 🔮 💰 💎 💾 💜 🍪 🌞 🌍 🐌 🐓 🍄 )
function random_emoji {
echo -n "$EMOJI[$RANDOM%$#EMOJI+1]"
}
PROMPT="$(random_emoji) "
RPROMPT='%c'
@acook
acook / keypress.rb
Created December 2, 2012 18:42
Read keypresses from user in terminal, including arrow keys using pure Ruby. This has since been folded into a much more robust gem called Remedy. https://rubygems.org/gems/remedy & https://github.com/acook/remedy
require 'io/console'
# Reads keypresses from the user including 2 and 3 escape character sequences.
def read_char
STDIN.echo = false
STDIN.raw!
input = STDIN.getc.chr
if input == "\e" then
input << STDIN.read_nonblock(3) rescue nil
@rkumar
rkumar / gist:445735
Created June 20, 2010 10:47
ruby's OptionParser to get subcommands
#!/usr/bin/env ruby -w
## Using ruby's standard OptionParser to get subcommand's in command line arguments
## Note you cannot do: opt.rb help command
## other options are commander, main, GLI, trollop...
# run it as
# ruby opt.rb --help
# ruby opt.rb foo --help
# ruby opt.rb foo -q
# etc
@henrik
henrik / hash_deep_diff.rb
Created July 14, 2009 08:38
Recursively diff two Ruby hashes.
# Recursively diff two hashes, showing only the differing values.
# By Henrik Nyh <http://henrik.nyh.se> 2009-07-14 under the MIT license.
#
# Example:
#
# a = {
# "same" => "same",
# "diff" => "a",
# "only a" => "a",
# "nest" => {