Info

Each test must return true for all numbers that would be interpreted by major web browsers as a hexadecimal number, but in the string type.

Remember that all acceptable hexadecimal numbers begin with "0x...", where the "x" may be uppercase. Furthermore, remember that a negative hexadecimal number would lead with a negative sign (i.e. "-0x...").

Important note: There MUST be an assumption that the string does contain a number! This means that simply searching for the letter "x" (uppercase or lowercase) is sufficient.

Second important note: Since the string is unlikely to be a hexadecimal string, I have tested for "false" a greater number of times than true.

Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var hexString = "0x12345";
    var nonHexString = "12345";
    var longHexString = "-0X123456789123456789";
    var longNonHexString = "123456789123456789";
    
    function charAt(str) {
      if (str.charAt(1).toLowerCase() === "x" || str.charAt(2).toLowerCase() === "x") {
        return true;
      };
    };
    
    function charAtTwo(str) {
      if (str.charAt(1) === "x" || str.charAt(2) === "x" || str.charAt(1) === "X" || str.charAt(2) === "X") {
        return true;
      };
    };
    
    function regExp(str) {
      if (/x/i.test(str)) {
        return true;
      };
    };
    
    function indexOf(str) {
      if (str.toLowerCase().indexOf("x") > -1) {
        return true;
      };
    };
    
    function indexOfTwo(str) {
      if (str.indexOf("x") > -1 || str.indexOf("X") > -1) {
        return true;
      };
    };
  };
</script>

Test runner

Warning! For accurate results, please disable Firebug before running the tests. (Why?)

Java applet disabled.

charAt(hexString);
charAt(longHexString);
charAt(nonHexString);
charAt(longNonHexString);
charAt(nonHexString);
charAt(longNonHexString);
charAt(nonHexString);
charAt(longNonHexString);

charAtTwo(hexString);
charAtTwo(longHexString);
charAtTwo(nonHexString);
charAtTwo(longNonHexString);
charAtTwo(nonHexString);
charAtTwo(longNonHexString);
charAtTwo(nonHexString);
charAtTwo(longNonHexString);

indexOf(hexString);
indexOf(longHexString);
indexOf(nonHexString);
indexOf(longNonHexString);
indexOf(nonHexString);
indexOf(longNonHexString);
indexOf(nonHexString);
indexOf(longNonHexString);

indexOfTwo(hexString);
indexOfTwo(longHexString);
indexOfTwo(nonHexString);
indexOfTwo(longNonHexString);
indexOfTwo(nonHexString);
indexOfTwo(longNonHexString);
indexOfTwo(nonHexString);
indexOfTwo(longNonHexString);

regExp(hexString);
regExp(longHexString);
regExp(nonHexString);
regExp(longNonHexString);
regExp(nonHexString);
regExp(longNonHexString);
regExp(nonHexString);
regExp(longNonHexString);

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