kangkyu

# return the unique elements of this array:
# a = []
# 10000000.times{a.push(rand(100))}
# no array.uniq please

# extra credit -- in one function, count all the occurrences of each element of a

a = []
10000000.times{a.push(rand(100))}

kangkyu

# Take this array:

a = [[1, 2], [3, 4], [5, 6], [7, 8], [9, 10]]

# and transform it into this array

# [[1, 2, 3], [4, 5, 6], [7, 8, 9], [10, 0, 0]]

flat = a.flatten

kangkyu

# write a method called "transpose" that takes this array of arrays:

# [
# ['first', 'second'],
# ['third', 'fourth']
# ]

# and transposes it into this array of arrays

# [

kangkyu

elm package install
elm package install evancz/elm-html

<add & edit Bingo.elm>

# elm make --warn Bingo.elm --output index.html
elm reactor # and then open Bingo.elm file

module Bingo where

kangkyu

Use guard-shell gem.

# terminal (at exercism/ruby/)
gem install guard guard-shell
guard init shell

# Guardfile

kangkyu

##Quiz: Lesson 3 Solutions

####1. What's the difference between rendering and redirecting? What's the impact with regards to instance variables, view templates?

Rendering displays a view template that accesses the instance variables available in that action. Therefore, instance variables must be declared in that action before the render will work. Redirecting will send a new request to the browser based on the route path that was provided. In this case, the instance variables in that action are not related to the redirected view.

####2. If I need to display a message on the view template, and I'm redirecting, what's the easiest way to accomplish this?

You can use flash, which saves the message with a session. The message will be displayed on your next action and will be removed after that. flash[:message] = 'Your account was created.' redirect_to :back

kangkyu

git clone https://github.com/kangkyu/list-of-hamburger-restaurants.git
cd list-of-hamburger-restaurants
echo "# list-of-hamburger-restaurants" >> README.md
git add README.md
git commit -m "first commit"
git push -u origin master

kangkyu

<form action="http://google.com">
    <input type="submit" value="Go to Google">
</form>

<a href="http://google.com">Go to Google</a>

kangkyu

(0..9).to_a + ('a'..'z').to_a + ('A'..'Z').to_a + %w(! @ # $ % ^ & * < > ?)
a = _
a.shuffle.pop(9).join

kangkyu

  - if @task.errors.any?
    = content_tag(:div, class: ["alert", "alert-danger", "alert-dismissible"], role: "alert", id: "error-explanation") do
      = content_tag(:button, class: "close", type: "button", "data-dismiss"=> "alert") do
        = content_tag(:span, escape_once("×"), "aria-hidden"=> "true")
        = content_tag(:span, "Close", class: "sr-only")
      %p= pluralize(@task.errors.count, "error") + " prohibited this user from being saved"
      %ul
        - @task.errors.full_messages.each do |msg|
          %li= msg