Run-length encoding: Difference between revisions

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@@ Line 877: / Line 877: @@
 =={{header|Ruby}}==
-<lang ruby>def encode(s)
+<lang ruby>def encode(string)
-  s.scan(/(.)(\1*)/).collect do |matchgroups|
+  string.scan(/(.)(\1*)/).collect do |matchgroups|
     char, repeat = matchgroups
     [char, 1 + repeat.length]
@@ Line 884: / Line 884: @@
 end
-def decode(e)
+def decode(encoding)
-  e.inject("") do |decoded, pair|
+  encoding.inject("") do |decoding, pair|
     char, length = pair
-    decoded << char * length
+    decoding << char * length
   end
 end
 orig = "WWWWWWWWWWWWBWWWWWWWWWWWWBBBWWWWWWWWWWWWWWWWWWWWWWWWBWWWWWWWWWWWWWW"
-encoded = encode(orig)    # => [["W", 12], ["B", 1], ["W", 12], ["B", 3], ["W", 24], ["B", 1], ["W", 14]]
+enc = encode(orig)    # => [["W", 12], ["B", 1], ["W", 12], ["B", 3], ["W", 24], ["B", 1], ["W", 14]]
-decoded = decode(encoded)
+dec = decode(enc)
-puts "success!" if decoded == orig</lang>
+puts "success!" if dec == orig</lang>
+This usage also seems to be idiomatic, and perhaps less cryptic:
+<lang ruby>def encode(string)
+  encoding = []
+  for char, repeat in string.scan(/(.)(\1*)/)
+    encoding << [char, 1 + repeat.length]
+  end
+  encoding
+end
+def decode(encoding)
+  decoding = ""
+  for char, length in encoding
+    decoding << char * length
+  end
+  decoding
+end</lang>
 =={{header|Smalltalk}}==