Added fire-and-fury.rb

Author: malachispencer

ruby/6kyu/fire-and-fury.rb

@@ -0,0 +1,29 @@
+=begin
+Codewars. 31/05/20. 'FIRE and FURY'. 6kyu. The President's phone is broken, the only letters still working are upper case EFIRUY. We must 
+decipher the president's tweets. FIRE = "You are fired!". FURY = "I am furious". In our tweet, any letters not spelling FIRE or FURY are 
+simply ignored. If consecutives of the same word are found, plural rules apply e.g. FIRE x2 = "You and you are fired!", FIRE x3 = "You and 
+you and you are fired!", FURY x2 = "I am really furious.", FURY x3 = "I am really really furious." If FIRE or FURY is found, or unexpected 
+characters are encountered, it must be a "Fake tweet." Here is the solution I developed to solve the challenge.
+1) We define our method fire_and_fury_ms, which takes a tweet in the form of a string as its argument.
+2) If the tweet contains any character that is not E, F, I, R, U or Y, we have encountered unexpected characters so we return "Fake tweet."
+3) So that we can remove all expected characters which don't form FIRE or FURY, we generate an array of every occurrence - in order of
+ appearance in the string - of FIRE and FURY using scan.
+4) If our array of FIRE and FURY is empty, we return "Fake tweet."
+5) Now we group our array according to same consecutives using chunk_while, then map over the chunks.
+6) If the first word in the sub-array is FIRE, we turn this sub-array into our deciphered string. Within this deciphered string we use
+ string interpolation and do "and you " multiplied by the size of the sub-array minus 1. So if there's 1 FIRE in the sub-array, "and you "
+ * 0 = "" so the chunk becomes "You are fired!". If there's 3 FIRE's, "and you " * 2 = "and you and you " so the chunk becomes
+ "You and you and you are fired!".
+7) If the first word in the sub-array is not FIRE, it must be fury, so in our false portion of the ternary operator, we do the same for
+ " really" but this time we place the space at the start of really, putting no space between "am" and " really". We did the opposite for
+ the FIRE cases.
+8) Now the tweet is deciphered, we join it back into a string, with each sentence delimited by a space. 
+=end
+
+def fire_and_fury_ms(t)
+ return "Fake tweet." if t.match(/[^EFIRUY]/)
+ t = t.scan(/FIRE|FURY/) ; return "Fake tweet." if t.empty? 
+ t.chunk_while(&:==).map {|w|
+ w[0] =~ /FIRE/ ? "You #{"and you " * (w.size-1)}are fired!" : 
+ "I am#{" really" * (w.size-1)} furious."}.join(" ")
+end