Data commit

Task/Run-length-encoding/Ruby/run-length-encoding-1.rb

@@ -0,0 +1,14 @@
+# run_encode("aaabbbbc") #=> [["a", 3], ["b", 4], ["c", 1]]
+def run_encode(string)
+  string
+    .chars
+    .chunk{|i| i}
+    .map {|kind, array| [kind, array.length]}
+end
+
+# run_decode([["a", 3], ["b", 4], ["c", 1]]) #=> "aaabbbbc"
+def run_decode(char_counts)
+  char_counts
+    .map{|char, count| char * count}
+    .join
+end

Task/Run-length-encoding/Ruby/run-length-encoding-2.rb

@@ -0,0 +1,9 @@
+def encode(string)
+  string.scan(/(.)(\1*)/).collect do |char, repeat|
+    [1 + repeat.length, char]
+  end.join
+end
+
+def decode(string)
+  string.scan(/(\d+)(\D)/).collect {|length, char| char * length.to_i}.join
+end

Task/Run-length-encoding/Ruby/run-length-encoding-3.rb

@@ -0,0 +1,11 @@
+def encode(string)
+  string.scan(/(.)(\1*)/).inject("") do |encoding, (char, repeat)|
+    encoding << (1 + repeat.length).to_s << char
+  end
+end
+
+def decode(string)
+  string.scan(/(\d+)(\D)/).inject("") do |decoding, (length, char)|
+    decoding << char * length.to_i
+  end
+end

Task/Run-length-encoding/Ruby/run-length-encoding-4.rb

@@ -0,0 +1,7 @@
+def encode(str)
+    str.gsub(/(.)\1*/) {$&.length.to_s + $1}
+end
+
+def decode(str)
+    str.gsub(/(\d+)(\D)/) {$2 * $1.to_i}
+end

Task/Run-length-encoding/Ruby/run-length-encoding-5.rb

@@ -0,0 +1,4 @@
+orig = "WWWWWWWWWWWWBWWWWWWWWWWWWBBBWWWWWWWWWWWWWWWWWWWWWWWWBWWWWWWWWWWWWWW"
+p enc = encode(orig)
+p dec = decode(enc)
+puts "success!" if dec == orig