Initial data commit

Task/History-variables/SenseTalk/history-variables-1.sensetalk

@@ -0,0 +1,14 @@
+// HistoryVariable.script
+properties
+	history: [], -- a list of all historical values
+	asTextFormat:"[[the last item of my history]]" -- always display the last value
+end properties
+
+to set newValue
+	push newValue nested into my history
+end set
+
+to rollback
+	pop my history
+	return it
+end rollback

Task/History-variables/SenseTalk/history-variables-2.sensetalk

@@ -0,0 +1,20 @@
+set x to be a new HistoryVariable
+
+tell x to set "Hello"
+put "x is now" && x -- display the current value
+
+tell x to set 88
+put "x is now" && x
+
+tell x to set "World"
+put "x is now" && x
+
+put "History of x:" && x's history -- non-destructively display the history
+
+tell x to set [9,6,3] -- set it to a list
+put "x is now" && x
+
+put "History of x:" && the history of x
+
+put "Rolling back:" && x.rollback -- remove the last value
+put "After rollback, x is now" && x