Initial data commit

Task/Sort-stability/Groovy/sort-stability.groovy

@@ -0,0 +1,10 @@
+def cityList = ['UK  London', 'US  New York', 'US  Birmingham', 'UK  Birmingham',].asImmutable()
+[
+    'Sort by city': { city -> city[4..-1] },
+    'Sort by country': { city -> city[0..3] },
+].each{ String label, Closure orderBy ->
+    println "\n\nBefore ${label}"
+    cityList.each { println it }
+    println "\nAfter ${label}"
+    cityList.sort(false, orderBy).each{ println it }
+}