Notes from representing nouns

notes_from_representing_nouns.rb

# ----- Representing hashes with arrays -----
hash = {
  'dog' => 'fighting',
  'michael jordan' => 'jumping',
  'army' => 'boxing'
}


array = [
  ['dog', 'fighting'],
  ['michael jordan', 'jumping'],
  ['army', 'boxing'],
]
array.find { |k, v| k == 'michael jordan' }[1] # => "jumping"
array.assoc('michael jordan')[1] # => "jumping"


array2 = [
  ["dog", "michael jordan", "army"], 
  ["fighting", "jumping", "boxing"]
]
array2[1][array2[0].index('michael jordan')] # => "jumping"



# --------- Making our own strings ---------
# 36 = 'a'
# 37 = 'b'
# 38 = 'c'
# ...

"abc"    # => "abc"
'a'.ord  # => 97
'b'.ord  # => 98
'c'.ord  # => 99
'A'.ord  # => 65


# ------- If we only had strings, how could we represent an array of strings? ----------
['abcd', 'lol']
['abc', 'def', 'ghi']

'(0)abc (1)def (2)ghi'


# ----------- Representing pwd ------------
# $ pwd
# /Users/josh/code/cp/daily/week1

"/Users/josh/code/cp/daily/week1"
['Users', 'josh', 'code', 'cp', 'daily', 'week1']


# ----------- The PATH variable -------------
# Which is an array of directories where I keep programs I want to run.
# $ echo "$PATH"
# /Users/josh/.opam/system/bin:/Users/josh/.gem/ruby/2.1.1/bin:/Users/josh/.rubies/ruby-2.1.1/lib/ruby/gems/2.1.0/bin:/Users/josh/.rubies/ruby-2.1.1/bin:/Users/josh/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/opt/X11/bin:/Users/josh/code/dotfiles/bin:/Users/josh/bin:/Users/josh/.cabal/bin

[ "/Users/josh/.opam/system/bin",
  "/Users/josh/.gem/ruby/2.1.1/bin",
  "/Users/josh/.rubies/ruby-2.1.1/lib/ruby/gems/2.1.0/bin",
  "/Users/josh/.rubies/ruby-2.1.1/bin",
  "/Users/josh/bin",
  "/usr/local/bin",
  "/usr/bin",
  "/bin:/usr/sbin",
  "/sbin:/usr/local/bin",
  "/opt/X11/bin",
  "/Users/josh/code/dotfiles/bin",
  "/Users/josh/bin",
  "/Users/josh/.cabal/bin",
]



# ---------  URL Params  --------------

# http://www.amazon.com/s/ref=nb_sb_noss_2?url=search-alias%3Daps&field-keywords=the+little+book+of+talent
url=search-alias%3Daps
field-keywords=the+little+book+of+talent
language=en

# utm_content=buffer9387d&utm_medium=social&utm_source=twitter.com&utm_campaign=buffer
utm_content=buffer9387d
utm_medium=social
utm_source=twitter.com
utm_campaign=buffer

{ 'utm_content'  => 'buffer9387d',
  'utm_medium'   => 'social',
  'utm_source'   => 'twitter.com',
  'utm_campaign' => 'buffer',
}


# ----------  See how data will change in representation as we change requirements ------------

# student name
'James'

# student names
['James', 'Dongmin', 'Matthew']

# student names with their favourite colour
{ 'James'   => 'Chocolate',
  'Dongmin' => 'Just pick one',
  'Matthew' => 'blue'
}

# student names with their favourite colour, 
# by their military branch
[{'name' => 'James', 'colour' => 'Chocolate', 'branch' => 'Air Force'},
 {'name' => 'Dongmin', 'colour' => 'Chocolate', 'branch' => 'Air Force'},
 {'name' => 'Matthew', 'colour' => 'Chocolate', 'branch' => 'Air Force'},
]

{ "army" => {
    'James'   => 'Chocolate',
    'Dongmin' => 'Just pick one',
  },
  "air-force" => {'Matthew' => 'blue'}
}["army"]
# => {"James"=>"Chocolate", "Dongmin"=>"Just pick one"}


# student names with their favourite colour, 
# by their military branch
# and instructors with their state of residence, by their names.
{ 'students' => {
    "army" => {
      'James'   => 'Chocolate',
      'Dongmin' => 'Just pick one',
    },
    "air-force" => {'Matthew' => 'blue'}
  },
  "instructors" => { "Josh"   => "CO",
    "Andrea" => "OH",
    "Rod"    => "IL",
  },
}['students']['army']['James']
# => "Chocolate"