Active Support Secrets - Speaker Deck

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Active Support Secrets

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Prem Sichanugrist @sikachu /sikachu

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Secrets

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String

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String#inquiry

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today = 'saturday' today = today.inquiry today.saturday? #=> true today.sunday? #=> false

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String#squish

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very_complex_sql = <<-‐SQL SELECT * FROM posts WHERE state='published' SQL # => " SELECT *\n FROM posts\n WHERE state='published'\n"

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very_complex_sql = <<-‐SQL.squish SELECT * FROM posts WHERE state='published' SQL # => "SELECT * FROM posts WHERE state='published'"

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String#strip_heredoc

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content = <<-‐README Hello World! README #=> " Hello\n World!\n"

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class FancyHello def initialize(user) if should_say_hello_to? user content = <<-‐README Hello World! README end end end #=> " Hello\n World!\

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class FancyHello def initialize(user) if should_say_hello_to? user content = <<-‐README Hello World! README end end end #=> "Hello\n World!\n"

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content = <<-‐README.strip_heredoc Hello World! README #=> "Hello\n World!\n"

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String#to_date String#to_datetime String#to_time

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Date.parse('2013-‐09-‐21') #=> Sat, 21 Sep 2013 '2013-‐09-‐21'.to_date #=> Sat, 21 Sep 2013 DateTime.parse('2013-‐09-‐21 09:00:00') #=> Sat, 21 Sep 2013 09:00:00 +0000 '2013-‐09-‐21 09:00:00'.to_datetime #=> Sat, 21 Sep 2013 09:00:00 +0000 Time.parse('09:00:00') #=> 2013-‐09-‐21 09:00:00 -‐0400 '09:00:00'.to_time #=> 2013-‐09-‐21 09:00:00 -‐0400

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Hash

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Hash#transform_keys

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hash = { foo: 'foo', bar: 'bar' } #=> {:foo=>"foo", :bar=>"bar"} hash.transform_keys { |key| key.to_s.capitalize } #=> {"Foo"=>"foo", "Bar"=>"bar"}

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Object

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Object#in?

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STARTING_POKEMONS = %w(Chespin Fennekin Froakie) if STARTING_POKEMONS.include?(current_pokemon) # ... end

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STARTING_POKEMONS = %w(Chespin Fennekin Froakie) if current_pokemon.in?(STARTING_POKEMONS) # ... end

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Object#presence

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"Hello".presence #=> "Hello" nil.presence #=> nil

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state = if params[:state].present? params[:state] end country = if params[:country].present? params[:country] end region = state || country || 'US'

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region = params[:state].presence || params[:country].presence || 'US'

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http://guides.rubyonrails.org

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Thank you! Prem Sichanugrist (@sikachu) Sides: http://bit.ly/as-secret

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Thank you! Prem Sichanugrist (@sikachu) Sides: http://bit.ly/as-secret I also have some stickers to give away