rafaltrojanowski

require 'date'

def daily_cost(start_date, end_date, time_period_costs)
  daily_cost = {}

  if start_date > end_date
    raise "Wrong time period given."
  end
  
  (start_date..end_date).each do |date|

rafaltrojanowski

1. Install vscodevim

2. Run from terminal:
defaults write com.microsoft.VSCode ApplePressAndHoldEnabled -bool false # Key repeat

3. jj:
Add to settings.json:

"vim.insertModeKeyBindings": [
        {

rafaltrojanowski

Description

This simple script will take a picture of a whiteboard and use parts of the ImageMagick library with sane defaults to clean it up tremendously.

The script is here:

#!/bin/bash
convert "$1" -morphology Convolve DoG:15,100,0 -negate -normalize -blur 0x1 -channel RBG -level 60%,91%,0.1 "$2"

Results

rafaltrojanowski

# Source:
# https://macpaw.com/how-to/startup-disk-full-on-mac-os-x

#!/usr/bin/env bash

rm -rf ~/Library/Caches/*
rm -rf /Library/Caches/*
rm -rf ~/Music/iTunes/Previous\ iTunes\ Libraries/*
rm -rf ~/Library/Application\ Support/MobileSync/Backup/*
rm -rf ~/Library/iTunes/iPhone\ Software\ Updates/*

rafaltrojanowski

Tips for Money Related Arithmetic in Ruby

1. Never use float for performing arithmetic calculations relating to money.

   Floating numbers can sometimes show funky behaviour. It is not Ruby’s fault but the very implementation of floating numbers raises precision issues.

Examples of odd behaviour:

rafaltrojanowski

import Component from '@ember/component'

export default Component.extend({
  
  // Note: I do believe that counter should start couting from 0
  // that has been fixed with following implementation.
  // Previous implemention updated counter on component initialization, so in fact it resulted with counting from 1

  count: 0,
  interval: 1000, // I would extract that property to be able to modify it quickly without jumping into details of implementation.

rafaltrojanowski

#Rotating Server Logs with LogRotate

Logrotate is a UNIX utility that does following operations:

1. Rotates the log file when file size reaches a specific size or after a specified duration
2. Continues to write the log information to the newly created file after rotating the old log file
3. Compresses the rotated log files
4. Specifies compression option for the rotated log files

rafaltrojanowski

Gemfile.lock
junk.*

rafaltrojanowski

module Subject
  def register_observer()
    raise NotImplementedError
  end

  def remove_observer()
    raise NotImplementedError
  end

  def notify_observers()

rafaltrojanowski

sample_input_0 = """
10
2
"""
sample_input_1 = """
100
2
"""

sample_input_2 = """