Data commit

Task/Balanced-brackets/Elena/balanced-brackets.elena

@@ -0,0 +1,46 @@
+import system'routines;
+import extensions;
+import extensions'text;
+
+randomBrackets(len)
+{
+    if (0 == len)
+    {
+        ^emptyString
+    }
+    else
+    {
+        var brackets :=
+            Array.allocate(len).populate:(i => $91)
+            +
+            Array.allocate(len).populate:(i => $93);
+
+        brackets := brackets.randomize(len * 2);
+
+        ^ brackets.summarize(new StringWriter()).toString()
+    }
+}
+
+extension op
+{
+    get isBalanced()
+    {
+        var counter := new Integer(0);
+
+        self.seekEach:(ch => counter.append((ch==$91).iif(1,-1)) < 0);
+
+        ^ (0 == counter)
+    }
+}
+
+public program()
+{
+    for(int len := 0, len < 9, len += 1)
+    {
+        var str := randomBrackets(len);
+
+        console.printLine("""",str,"""",str.isBalanced ? " is balanced" : " is not balanced")
+    };
+
+    console.readChar()
+}