ruby_building_blocks

A few small coding challenges

##caesar_cipher

#caesar_cipher takes two arguments, the string to encode and an integer of the shift factor. This only affects letters, and wraps the character when it passes Z or z, preserving the character's case.

caesar_cipher("Wow this is pretty cool!", 5)
=> "Btb ymnx nx uwjyyd httq!"

##stock_picker

#stock_picker takes an array argument containing a list of stock prices over the course of array.length days. The method will return the day you should buy and the day you should sell for maximum profit.

stock_picker([45, 23, 1, 2, 5, 22, 2])
=> [1, 22]

##substrings

#substrings takes a string argument followed by an array of terms. The method will return a hash containing any terms that were found in the string, and how many times they were found.

substrings("Do you believe in miracles?", ["do", "I", "think", "mir", "e"])
=> {"do"=>1, "I"=>3, "mir"=>1, "e"=>4}

##bubble_sort and bubble_sort_by

#bubble_sort takes an array argument and sorts the array using the bubble sort algorithm. This algorithm compares the first and second, swaps the values if first is larger, then compares second and third until first iteration is complete. Then the pattern repeats

bubble_sort([2, 1, 5, 6, 7])
=> [1, 2, 5, 6, 7]

#bubble_sort_by works the same way, except that a block is taken as the sorting criteria. If the result of the sorting criteria is negative, the values will swap

bubble_sort_by(["Tom", "Steven", "Suzy", "Julia"]){ |left, right| right.length - left.length }
=> ["Tom", "Suzy", "Julia", "Steven"]

##enumerable.rb

This file contains common enumerable methods, custom built. They are:

• my_each
• my_each_with_index
• my_select
• my_all?
• my_any?
• my_none?
• my_count
• my_map
• my_inject