I have this small function that's behaving oddly to me. Easy enough to work around, but enough to pique my curiosity.

function formatNumber(number,style) {

if (typeof style == 'number') {
    style = style.toString();
    }

return (number).format(style);

}

The return format part is based on another function that requires the style variable to be a string to work properly, so I'm just checking if style is a number and if it is to convert it to a string. When the function above is written as is, the format function format doesn't work properly. However when I write it as simply:

return (number).format(style.toString());

Everything works. Is there a difference between putting the .toString function inside the format call vs performing it before hand and setting it as the variable style?