code_warrior_code

code_warrior_code.rb

# key word arguemtents with options
def foo(a, **b)
  [a,b]
end
foo(1, a: 2, b:3) #=> [1, {:a=>2, :b=>3}]

# === regex
# http://www.codewars.com/kata/did-she-say-hallo/ruby
# my solution
def validate_hello(greetings)
  !!(greetings =~ /hello|ciao|salut|hallo|czesc|ahoj|Hola/i)
end

# best
def validate_hello(greetings)
  /hello|ciao|salut|hallo|hola|ahoj|czesc/i === greetings
end

# === http://ruby-doc.org/core-2.3.0/Regexp.html#method-i-3D-3D-3D
#/^[a-z]*$/ === "HELLO" #=> false
#/^[A-Z]*$/ === "HELLO" #=> true


# http://www.codewars.com/kata/grouped-by-commas/ruby
#   1  ->           "1"
#  10  ->          "10"
# 100  ->         "100"
#1000  ->       "1,000"
#10000  ->      "10,000"
#100000  ->     "100,000"
#1000000  ->   "1,000,000"
#35235235  ->  "35,235,235"

def solution(n)
  n.to_s.reverse.scan(/\d{1,3}/).join(',').reverse
end

# http://www.codewars.com/kata/adding-ordinal-indicator-suffixes-to-numbers/solutions/ruby
def number_to_ordinal(number)
  return '0' if number == 0
  rules = { 1 => 'st', 2 => 'nd', 3 => 'rd'}
  rules.default = 'th'
  number.to_s + ((number % 100).between?(11,13) ? 'th' : rules[number % 10])
end