code: function(string) {
      var chars = new Array(string.length);
  
      var charCode;
      for (var i = 0, len = chars.length; i < len; ++i) {
        charCode = string.charCodeAt(i);
        if (charCode > 96 && charCode < 123) {
          charCode -= 32;
        }
  
        chars[i] = String.fromCharCode(charCode);
      }
  
      return chars.join('');
    }
docs: Converts all of a string's characters to uppercase. This duplicates
  `String.prototype.toUpperCase`.
  
  @memberOf R.strings
  @param {string} string The string to upcase.
  @returns {string} The string w/ characters capitalized.
  
  @examples
  R.strings.toUpperCase('foo')   // => 'FOO'
  R.strings.toUpperCase(' foo ') // =~ /FOO/