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Task/Odd-word-problem/CoffeeScript/odd-word-problem-1.coffee

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+isWordChar = (c) -> /^\w/.test c
+isLastChar = (c) -> c is '.'
+
+# Pass a function that returns an input character and one that outputs a
+# character. JS platforms' ideas of single-character I/O vary widely, but this
+# abstraction is adaptable to most or all.
+oddWord = (get, put) ->
+	forwardWord = ->
+		loop
+			# No magic here; buffer then immediately output.
+			c = get()
+			put(c)
+			unless isWordChar(c)
+				return not isLastChar(c)
+	
+	# NB: (->) is a CoffeeScript idiom for no-op.
+	reverseWord = (outputPending = (->)) ->
+		c = get()
+		if isWordChar(c)
+			# Continue word.
+			# Tell recursive call to output this character, then any previously
+			# pending characters, after the next word character, if any, has
+			# been output.
+			reverseWord ->
+				put(c)
+				outputPending()
+		else
+			# Word is done.
+			# Output previously pending characters, then this punctuation.
+			outputPending()
+			put(c)
+			return not isLastChar(c)
+	
+	# Alternate between forward and reverse until one or the other reports that
+	# the end-of-input mark has been reached (causing a return of false).
+	continue while forwardWord() and reverseWord()

Task/Odd-word-problem/CoffeeScript/odd-word-problem-2.coffee

@@ -0,0 +1,23 @@
+isWordChar = (c) -> /^\w/.test c
+isLastChar = (c) -> c is '.'
+
+oddWord = (get, put) ->
+	forwardWord = ->
+		loop
+			c = get()
+			put(c)
+			unless isWordChar(c)
+				return not isLastChar(c)
+	
+	reverseWord = (outputPending = (->)) ->
+		c = get()
+		if isWordChar(c)
+			reverseWord ->
+				put(c)
+				outputPending()
+		else
+			outputPending()
+			put(c)
+			return not isLastChar(c)
+	
+	continue while forwardWord() and reverseWord()

Task/Odd-word-problem/CoffeeScript/odd-word-problem-3.coffee

@@ -0,0 +1,27 @@
+# Redefine as necessary for target platform.
+println = (z) -> console.log z
+
+testData = [
+	[
+		"what,is,the;meaning,of:life."
+		"what,si,the;gninaem,of:efil."
+	]
+	[
+		"we,are;not,in,kansas;any,more."
+		"we,era;not,ni,kansas;yna,more."
+	]
+]
+
+results = for [testString, expectedResult] in testData
+	# This test machinery uses string buffers for input and output. If your JS
+	# platform sports single-character I/O, by all means, adapt to taste.
+	getCursor = 0
+	putBuffer = ""
+	get = ->
+		testString.charAt getCursor++
+	put = (c) ->
+		putBuffer += c
+	oddWord(get,put)
+	[testString, expectedResult, putBuffer, putBuffer is expectedResult]
+
+println result for result in results