Data commit

Task/Queue-Definition/Smalltalk/queue-definition.st

@@ -0,0 +1,20 @@
+OrderedCollection extend [
+   push: obj [ ^(self add: obj) ]
+   pop [
+       (self isEmpty) ifTrue: [
+          SystemExceptions.NotFound signalOn: self
+                reason: 'queue empty'
+       ] ifFalse: [
+          ^(self removeFirst)
+       ]
+   ]
+]
+
+|f|
+f := OrderedCollection new.
+f push: 'example'; push: 'another'; push: 'last'.
+f pop printNl.
+f pop printNl.
+f pop printNl.
+f isEmpty printNl.
+f pop. "queue empty error"