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Navigating Ruby Files with Vim - The Cheat Sheet

Precision motions for Ruby

Look up Ruby motions by running :help ruby-motion.

command	effect

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Navigating Ruby Files with Vim - Installation Instructions

In this document, you'll find links to each of the tools mentioned in the screencast series, Navigating Ruby Files with Vim.

Recommended Vim plugins

Here is the complete list of recommended Vim plugins:

• [vim-ruby][]
• [matchit][]

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tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

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arr = [1, 2, 3, 4]
new_arr = arr.map { |x| x * 3 }
puts new_arr.inspect                  # => [3, 6, 9, 12]

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class Gear
  attr_reader :chainring, :cog, :rim, :tire
  def initialize(chainring, cog, rim, tire)
    @chainring = chainring
    @cog       = cog
    @rim       = rim
    @tire      = tire
  end

  def ratio

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array = [1, 2, 3, 4]

array.collect! do |n|
  n ** 2
end

puts array.inspect      # => [1, 4, 9, 16]

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cube = Proc.new { |x| x ** 3 }

[1, 2, 3].collect!(&cube)    #=>[ 1, 8, 27]

[4, 5, 6].map!(&cube)       #=>[64, 125, 216]

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lambda { puts "Hello!" }

#Is just about the same as

Proc.new { puts "Hello!" }

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lam = lambda { |x| puts x }    # creates a lambda that takes 1 argument
lam.call(2)                    # prints out 2
lam.call                       # ArgumentError: wrong number of arguments (0 for 1)
lam.call(1,2,3)                # ArgumentError: wrong number of arguments (3 for 1)

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proc = Proc.new { |x| puts x } # creates a proc that takes 1 argument
proc.call(2)                   # prints out 2
proc.call                      # returns nil
proc.call(1,2,3)               # prints out 1 and forgets about the extra arguments