coffeenizedConvertjs.coffee

log = (x) ->
  console.log x

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'

hasData = (x) ->
  x != undefined && 
    ( x || x == null || x == 0 || isNaN(x) || x == '')

convert = (x, y) ->
    switch y
        when 'number'
            parseInt x
        when 'boolean'
            !!x
        when 'string'
            x + ''
        when undefined
            log(canBeArgs)
            '{ number : '    + -(-x)     + 
                ' , boolean : ' + !!x       + 
                ' , string : '  + x + ''    + ' }';
        else
            log(typeErr);
            null

showResult = (x, y) ->
    data          = if ( x != '' ) then x else '(empty string)' 
    dataType      = if ( y ) then '(' + y + ')' else '' 
    convertedData = convert(x, y)
    
    convertedData != null && log(dataType + data + ' -> ' + convertedData )