carolvisoto

require 'soundcloud'

class StoriesController < ApplicationController
  
  def index
    @stories = Story.all
  end

  def new
    get_user

carolvisoto

# a simple block:
p [1,2,3].map { |i| i.to_s }

# a block with do/end
p [1,2,3].map do |i|
  i.to_s
end

# even fancier, with a function reference
p [1,2,3].map(&:to_s)

carolvisoto

# Iterator methods without blocks are called Enumerators
[1,2,3].each_index # => #<Enumerator: [1, 2, 3]:each_index>
0.upto(10) # => #<Enumerator: 0:upto(10)>

# You can call any Enumerable method on Enumerators
[1,2,3].each_index.map {|i| i + 10 } # => [10, 11, 12]
0.upto(10).map {|i| i + 10 } # => [10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20]

# See documentation about Enumerables

carolvisoto

# Returns all permutations of string s
def permutations(s)
  # For single characters just return one solution, the character
  if s.size <= 1
    [s] 
  else
    # calculate all permutations without the first character
    # and then iterate over each
    permutations(s[1..-1]).flat_map do |x|
      # for each position in permutation x