Data update

Task/Variable-declaration-reset/Pluto/variable-declaration-reset.pluto

@@ -0,0 +1,19 @@
+local s = {1, 2, 2, 3, 4, 4, 5}
+
+-- There is no output as 'prev' is created anew each time
+-- around the loop and set implicitly to nil.
+for i = 1, #s do
+    local curr = s[i]
+    local prev
+    if i > 1 and curr == prev then print(i) end
+    prev = curr
+end
+
+-- Now 'prev' is created only once and reassigned
+-- each time around the loop producing the desired output.
+local prev
+for i = 1, #s do
+    local curr = s[i]
+    if i > 1 and curr == prev then print(i) end
+    prev = curr
+end