convert5.js

/*
 convert.js by chuck
 
 2015.9.5 start to work 
 2015.9.19 revision
 
 convert.js enables you to convert date to other data type
*/


(function(w){
var log = function(x) { console.log(x); }

var 
  usage     = 'Usage : \n' + 
                '1st arg : data to convert. \n ' + 
                '2nd arg : data type to convert(not necessary).\n' + 
                ' ex) cnv(false,\'number\');',
  canBeArgs = '* You can also use 2nd arg as data type.',
  typeErr   = '* Type error! number, boolean or string are valid as 2nd arg.',
  something = 'Something happened, something';


var hasData = function(x) {
    return x !== undefined && 
            ( x || x === null || x === 0 || isNaN(x) || x === '' );
};

var convert = function(x, y) {
    switch(y) {
        case 'number':
            return parseInt(x);
        case 'boolean':
            return !!x;
        case 'string':
            return x + '';
        case undefined:
            log(canBeArgs);
            return '{ number : '    + -(-x)     + 
                    ' , boolean : ' + !!x       + 
                    ' , string : '  + x + ''    + ' }';
        default:
            log(typeErr);
            return null;
    }
};

var showResult = function(x, y) {
    var 
      data          = ( x !== '' ) ? x : '(empty string)' ;
      dataType      = ( y ) ? '(' + y + ')' : '' ;
      convertedData = convert(x, y);
    convertedData !== null && log(dataType + data + ' -> ' + convertedData );
};

var cnv = function(x, y) {
    hasData(x) ? showResult(x, y) : log(usage);
};

(w.cnv === undefined) && ( w.cnv = cnv )

})(window);