Meet calc2.js, a small crappy math library to cover some math stuff for my calculator..

    var calc = new Calculator();

    console.log(
      calc.eval("2+6*4")
    ); 
    // evaluates math expressions, without the security risk
    // expected output: 26

    console.log(
      calc.tetra(2,3)
    ); 
    // tetration, comes after exponentation: does 2^^3
    // expected output: 134217728