Cloud development machines

 A list of cloud servers for basic hobby-level software development.

All prices per month:

• DigitalOcean: $4 for 512Mb memory, 10Gb file storage, 500Gb transfer
• $6 for 1Gb memory, 25Gb file storage, 1000Gb transfer
• Block storage:
• $10 for 100Gb
• Object storage:
• $5 for 250Gb, 1Tb outbound transfer
• Images: $0.06/GiB/mo
• = $1.50 for 25Gb
• Vultr: $6 for 1Gb memory, 25Gb file storage, 2Tb transfer
• Block storage: $1 per 10Gb
• Object storage: $5 for 250Gb, 1Tb outbound transfer
• Linode: $5 for 1Gb memory, 25Gb file storage, 1Tb transfer
• Block storage: $1 per 10Gb
• Object storage: $5 for 250Gb, 1Tb outbound transfer
• Images:
• $0.10 for 1Gb x 25
• $2.50 for 25Gb x 25
• Kamatera: $4 for 1Gb memory, 20Gb file storage, 5000Gb transfer
• File storage:
• $6 for 30Gb
• $7 for 40Gb
• $8 for 50Gb
• $12 for 100Gb

(source)

Javascript web frameworks, 2022

 A list:

• React - library, jsx, facebook
• Vue - easier than backbone, good cli
• Angular - typescript, heavy, google
• Ember - opinionated, fast development <-- this one is good
• Backbone - stable, reliable, data rendering, easy, lightweight
• Aurelia - convention over configuration, standards, very easy
• Lit - very fast, lightweight, google
• Mithril - lean, fast, simple

How to manage schema migrations (track database changes)

A list. Alternatives to the popular/enterprise options:

• DBIx::Class::Migration - Perl. works but fiddly

• App::JESP - Perl. Simpler

• Flyway - popular

• Liquibase - popular

• MyBatis migrations - popular

• DBDeploy - popular

• Active Record Migrations - Ruby?

• Squitch - standalone

• Skeema - stands out

Why Android is better then iPhone

A list:

• Homescreen widgets
• Custom homescreen launchers, e.g. Nova Launcher
• Custom homescreen icon arrangement
• Notifications persist visibly in status bar so you don't forget them
• Plentiful game console emulators
• Easily download files from web pages
• Easily load mp3 music without special software
• Save any file to the phone storage, like you can with Windows/Mac/Linux

Some icons for webpages

A list:

• Glyphicons
• Fontawesome
• JQuery UI (how do you make them bigger? maybe use this?)

Shuffle lines in bash

#!/bin/bash
# Print out the lines from a file, in a random order
FILE=$1
if [[ -z $FILE ]]
then
    echo "usage: shuffle [filename]"
    exit 1
fi
for i in `cat $FILE`; do echo "$RANDOM $i"; done | sort | sed -r 's/^[0-9]+ //'

Thanks

Get unique values from an array in Perl

# Unique an array

@unique_list = keys %{{ map { $_ => 1 } @big_list }}; # aka dedupe a list

# Unique a hash on a specified key 'id'

@unique_list = values %{{ map { $_->{id} => $_ } %big_hash }};

Explanation

Perl: Subtract one list from another list

my @difference = grep { not ($_ ~~ \@small_array) } @big_array;


# ~~ is the smart matching operator

Comma separated lists in XSL

<xsl:if test="position() != last()">

Pass in an extra parameter to perl -n

Use an environment variable

for k in $(cat list_of_ids); do export KK=$k; perl -F"\t" -lane'print if ($F[3] eq $ENV{KK})' data/master_list_of_queries >> new_data_file; done