cassioscabral

While attempting to explain JavaScript's reduce method on arrays, conceptually, I came up with the following - hopefully it's helpful; happy to tweak it if anyone has suggestions.

Intro

JavaScript Arrays have lots of built in methods on their prototype. Some of them mutate - ie, they change the underlying array in-place. Luckily, most of them do not - they instead return an entirely distinct array. Since arrays are conceptually a contiguous list of items, it helps code clarity and maintainability a lot to be able to operate on them in a "functional" way. (I'll also insist on referring to an array as a "list" - although in some languages, List is a native data type, in JS and this post, I'm referring to the concept. Everywhere I use the word "list" you can assume I'm talking about a JS Array) This means, to perform a single operation on the list as a whole ("atomically"), and to return a new list - thus making it much simpler to think about both the old list and the new one, what they contain, and

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•_•)
( •_•)>⌐■-■
(⌐■_■)

cassioscabral

on new_tab()
  tell application "Terminal"
  activate
  tell application "System Events" to tell process "Terminal" to keystroke "t" using command down
  end tell
end new_tab

cassioscabral

echo 'export PATH=$HOME/local/bin:$PATH' >> ~/.bashrc
. ~/.bashrc
mkdir ~/local
mkdir ~/node-latest-install
cd ~/node-latest-install
curl http://nodejs.org/dist/node-latest.tar.gz | tar xz --strip-components=1
./configure --prefix=~/local
make install # ok, fine, this step probably takes more than 30 seconds...
curl https://www.npmjs.org/install.sh | sh

cassioscabral

it "should access the page 20 times" do
  beginning_time_all = Time.now
  (1..20).each do |i|
    beginning_time = Time.now
    visit "/my/page"
    end_time = Time.now
    puts "Time elapsed #{(end_time - beginning_time)*1000} milliseconds"
  end
  end_time_all = Time.now
  puts "ALL -> Time elapsed #{(end_time_all - beginning_time_all)*1000} milliseconds"

cassioscabral

@all_posts = []

@categories = Category.includes(:posts)
@categories.each do |category|
  @all_posts.concat(category.posts.limit(3))
end

# precisando acessar uma category de um post == post.category
@all_posts.each do |post|
  post.category

cassioscabral

.ags-script-color {
  background: #B9D9FF;
}


.antlr-color {
  background: #9DC3FF;
}

cassioscabral

5 entertaining things you can find with the GitHub Search API

Let's have some command-line fun with curl, [jq][1], and the [new GitHub Search API][2].

Today we're looking for:

• The hottest repositories created in the last week.
• The oldest user accounts with zero followers. (So sad.)
• Issue trends by language.
• Clojure projects defying convention.

cassioscabral

=Navigating=
    visit('/projects')
    visit(post_comments_path(post))

=Clicking links and buttons=
    click_link('id-of-link')
    click_link('Link Text')
    click_button('Save')
    click('Link Text') # Click either a link or a button
    click('Button Value')

cassioscabral

#Model 

@user.should have(1).error_on(:username) # Checks whether there is an error in username 
@user.errors[:username].should include("can't be blank")  # check for the error message 

#Rendering
response.should render_template(:index)

#Redirecting 
response.should redirect_to(movies_path)