Data commit

Task/Balanced-brackets/JavaScript/balanced-brackets-2.js

@@ -0,0 +1,56 @@
+console.log("Supplied examples");
+var tests = ["", "[]", "][", "[][]", "][][", "[[][]]", "[]][[]"];
+for (var test of tests)
+{
+  console.log("The string '" + test + "' is " +
+      (isStringBalanced(test) ? "" : "not ") + "OK.");
+}
+console.log();
+console.log("Random generated examples");
+for (var example = 1; example <= 10; example++)
+{
+  var test = generate(Math.floor(Math.random() * 10) + 1);
+  console.log("The string '" + test + "' is " +
+      (isStringBalanced(test) ? "" : "not ") + "OK.");
+}
+
+function isStringBalanced(str)
+{
+  var paired = 0;
+  for (var i = 0; i < str.length && paired >= 0; i++)
+  {
+    var c = str[i];
+    if (c == '[')
+      paired++;
+    else if (c == ']')
+      paired--;
+  }
+  return (paired == 0);
+}
+
+function generate(n)
+{
+  var opensCount = 0, closesCount = 0;
+  // Choose at random until n of one type generated
+  var generated = "";
+  while (opensCount < n && closesCount < n)
+  {
+    switch (Math.floor(Math.random() * 2) + 1)
+    {
+      case 1:
+        opensCount++;
+        generated += "[";
+        break;
+      case 2:
+        closesCount++;
+        generated += "]";
+        break;
+      default:
+        break;
+    }
+  }
+  // Now pad with the remaining other brackets
+  generated +=
+      opensCount == n ? "]".repeat(n - closesCount) : "[".repeat(n - opensCount);
+  return generated;
+}