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index.js

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+function advancedCalculator(expression) {
+  try {
+    // Clean up the expression: remove invalid characters
+    if (!/^[\d\s+\-*/%^().]+$/.test(expression)) {
+      return "Error: Invalid characters in expression.";
+    }
+
+    // Replace ^ with Math.pow-compatible syntax
+    expression = expression.replace(/(\d+)\s*\^\s*(\d+)/g, 'Math.pow($1, $2)');
+
+    // Evaluate the expression using Function constructor
+    const result = Function('"use strict"; return (' + expression + ')')();
+
+    return Number.isFinite(result) ? result : "Error: Invalid calculation";
+  } catch (error) {
+    return "Error: Invalid expression";
+  }
+}
+
+// Example usage:
+console.log(advancedCalculator("3 + 5 * 2"));         // 13
+console.log(advancedCalculator("10 / 2 + 6"));        // 11
+console.log(advancedCalculator("2 ^ 3 + 1"));         // 9
+console.log(advancedCalculator("(5 + 3) * 2"));       // 16
+console.log(advancedCalculator("10 % 3 + 4"));        // 5
+console.log(advancedCalculator("10 / (5 - 5)"));      // Error: Invalid calculation
+console.log(advancedCalculator("2 + bad_input"));     // Error: Invalid characters in expression.