Get directory of a file name in Javascript

Question

How to get the directory of a file?

For example, I pass in a string

C:\\Program Files\\nant\\bin\\nant.exe

I want a function that r

Answer 1

And this?

If isn't a program in addressFile, return addressFile

function(addressFile) {
    var pos = addressFile.lastIndexOf("/");
    pos = pos != -1 ? pos : addressFile.lastIndexOf("\\");

    if (pos > addressFile.lastIndexOf(".")) {
        return addressFile;
    }

    return addressFile.substring(
        0,
        pos+1
    );
}


console.assert(getFileDirectory('C:\\Program Files\\nant\\bin\\nant.exe') === 'C:\\Program Files\\nant\\bin\\');
console.assert(getFileDirectory('/usr/bin/nant') === '/usr/bin/nant/');
console.assert(getFileDirectory('/usr/thisfolderhaveadot.inhere') === '/usr/');