Data commit

Task/Variable-declaration-reset/Wren/variable-declaration-reset.wren

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+var 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 null.
+for (i in 0...s.count) {
+    var curr = s[i]
+    var prev
+    if (i > 0 && curr == prev) System.print(i)
+    prev = curr
+}
+
+// Now 'prev' is created only once and reassigned
+// each time around the loop producing the desired output.
+var prev
+for (i in 0...s.count) {
+    var curr = s[i]
+    if (i > 0 && curr == prev) System.print(i)
+    prev = curr
+}