Need a basename function in Javascript

Question

I need a short basename function (one-liner ?) for Javascript:

basename(\"/a/folder/file.a.ext\") -> \"file.a\"
basename(\"/a/folder/file.ext\") -> \"f         


        

Answer 1

Fast without regular expressions, suitable for both path types '/' and '\'. Gets the extension also:

function baseName(str)
{
    let li = Math.max(str.lastIndexOf('/'), str.lastIndexOf('\\'));
    return new String(str).substring(li + 1);
}