Application development for iOS Devices

Since i’m in the middle of developing something to facilitate my database using experience over the titanium, i had stumbled upon the strict type related issue.
My requirement was to determine the type from the given sample or real value. so here is what i’ve done.

if (this.typeOf(sampleOrDefaultValue) == 'boolean') { ... }
else if (this.typeOf(sampleOrDefaultValue) == 'array') { ... }

thanks to the original author of the “typeOf” implementation -

    /**
     *
     * This implementation is taken from -
     * http://blogs.vertigo.com/personal/rbiggs/Blog/Lists/Posts/Post.aspx?List=02949b85-a29d-4682-abdb-a065bff28a03&ID=32&Web=e8261135-ffe2-4406-81bc-2d89564d6b99
     *
     * Method to test the type of data. It returns a string.
     * If the data is a JavaScript primitive, it will return
     * the string in lowercase. If the data is an object type,
     * it returns a string with an uppercase initial letter.
     * Array literals and object arrays are identified with
     * and initial uppercase letter string, as are object literals
     * and object objects. This is because JavaScript does not
     * distinguish between the literal and object versions of
     * these two datatypes.
     */
    this.typeOf = function(value) {
      // First check to see if the value is undefined.
      if (value == undefined) {
        return "undefined";
      }
      // Check for objects created with the "new" keyword.
      if (value instanceof Object) {
        // Check for a boolean object.
        if (value instanceof Boolean) {
          return "boolean";
          // Check for a number object.
        } else if (value instanceof Number) {
          // Test whether it's a float or int.
          return "number";

          // Check whether it's a string object.
        } else if (value instanceof String) {
          return "string";
          // Check whether it's an array object/array literal.
        } else if (value instanceof Array) {
          return "array";
          // Check whether it's a date object.
        } else if (value instanceof Date) {
          return "date";
          // Check whether it's a function object.
        } else if (value instanceof Function) {
          return "function";
          // Check whether it's and object object/object literal.
        } else if (value instanceof Object) {
          return "object";
        }

        // If these tests failed, check to see if we're
        // dealing with a literal.
      } else if (typeof value) {
        // Here we're testing for null. Get this,
        // JavaScript returns it as an object!
        // So first we check for object, then for value.
        if (typeof value == "object") {
          if (typeof value == "object" && !value) {
            return "null";
          }
          // If the value wasn't null, check if it is a literal.
        } else {
          // Check for a boolean literal.
          if (typeof value == "boolean") {
            return "boolean";
            // Check for a number literal.
          } else if (typeof value == "number") {
            return "number";
            // Check if it's a string literal.
          } else if (typeof value == "string") {
            return "string";
          }

        }

        // If it slipped through all these tests,
        // we're dealing with something undetectable.
        // Therefore return nothing.
      } else {
        return 'null';
      }
    };