Martin-Alexander

import random

g = random.randrange(-10, 11, 1)
f = random.randrange(-10, 11, 1)

a = []

for i in range(0,10):
    try:
        x = int(input(" %d" %g + " + " + "%d = " %f))

Martin-Alexander

DOM Manipulation/Parsing

Reading and Writing Element Attributes

Remember:

<element attribute="value">InnerHTML</element>

Example:

Martin-Alexander

Comparisons Between Ruby and JavaScript

Iterating through over an array and printing each element

Ruby:

my_array = ["first_element", "second_element", "third_element"]

my_array.each do |element|
  puts element

Martin-Alexander

Comparison Between AJAX and Ruby

Both of these pieces of code:

• Make an HTTP GET request to the same URL
• Parse the response (which is in JSON format) into datatypes (Hash for Ruby and Object for JavaScript)
• Retrieve the results array and iterate over each Star Wars character

Ruby

Martin-Alexander

{
    "window.zoomLevel": 0,
    "editor.minimap.enabled": false,
    "editor.fontFamily": "'monospace'",
    "editor.fontSize": 14,
    "files.exclude": {
        "**/node_modules": true
    },
    "files.defaultLanguage": "txt",
    "workbench.startupEditor": "newUntitledFile",

Martin-Alexander

<div class="btn-group mt-1 mx-auto">
  <button id="gantt-day" type="button" class="gantt-period btn btn-sm btn-secondary">Day</button>
  <button id="gantt-week" type="button" class="gantt-period btn btn-sm btn-secondary">Week</button>
  <button id="gantt-month" type="button" class="gantt-period btn btn-sm btn-secondary">Month</button>
</div>

<script>
  document.querySelectorAll(".gantt-period").forEach(function(button) {
    button.addEventListener("click", function(event) {
      railsGantt.gantt.change_view_mode(event.currentTarget.innerHTML);

Martin-Alexander

#!/bin/sh

mkdir $1 && cd $1 

yarn init
yarn add webpack webpack-dev-server \
babel-core babel-preset-es2015 \
babel-loader sass-loader css-loader style-loader \
extract-text-webpack-plugin \
node-sass --dev

Martin-Alexander

Reading and Writing to CSV files in Ruby

These are the very basics of reading and writing to CSV files in Ruby. For more details and other available options consider checking out the full documentation: here

---

Consider a given csv file scientists.csv with the following content:

Martin-Alexander

for project_dir in */; do 
  cd "$project_dir"
  git checkout master
  git checkout -- .
  git pull
  bundle install
  yarn install 
  rails db:drop db:create db:migrate db:seed 
  cd ..
done

Martin-Alexander

class Threater
  def self.run(iterations = 1_000_000)
    last_person_got_seat = 0.0
    total_runs = 0.0

    iterations.times do |i|
      if i % 1000 == 0
        print("\rNº of iterations: #{i.to_s.ljust(iterations.to_s.length)}")
      end
      last_person_got_seat += 1 if new.last_person_got_seat