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encode function #7

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encode function #7

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20 changes: 10 additions & 10 deletions lib/run_length_encoding.ex
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Original file line number Diff line number Diff line change
@@ -1,16 +1,16 @@
defmodule RunLengthEncoding do
@doc """
Generates a string where consecutive elements are represented as a data value and count.
"AABBBCCCC" => "2A3B4C"
For this example, assume all input are strings, that are all uppercase letters.
It should also be able to reconstruct the data into its original form.
"2A3B4C" => "AABBBCCCC"
"""
require Logger
require IEx

def encode(string) do
def encode(string) when string == "" do
""
end

def decode(string) do
def encode(string) do
%{"head" => head, "tail" => tail} = Regex.named_captures(~r/(?<head>#{String.at(string,0)}+)(?<tail>.*)/, string)
if String.length(head) == 1 do
"#{head}#{encode(tail)}"
else
"#{String.length(head)}#{String.at(head, 0)}#{encode(tail)}"
end
end
end
5 changes: 0 additions & 5 deletions test/run_length_encoding_test.exs
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Original file line number Diff line number Diff line change
Expand Up @@ -6,28 +6,23 @@ defmodule RunLengthEncodingTest do
assert RunLengthEncoding.encode("") === ""
end

@tag :pending
test "encode single characters only are encoded without count" do
assert RunLengthEncoding.encode("XYZ") === "XYZ"
end

@tag :pending
test "encode string with no single characters" do
assert RunLengthEncoding.encode("AABBBCCCC") == "2A3B4C"
end

@tag :pending
test "encode single characters mixed with repeated characters" do
assert RunLengthEncoding.encode("WWWWWWWWWWWWBWWWWWWWWWWWWBBBWWWWWWWWWWWWWWWWWWWWWWWWB") ===
"12WB12W3B24WB"
end

@tag :pending
test "encode multiple whitespace mixed in string" do
assert RunLengthEncoding.encode(" hsqq qww ") === "2 hs2q q2w2 "
end

@tag :pending
test "encode lowercase characters" do
assert RunLengthEncoding.encode("aabbbcccc") === "2a3b4c"
end
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