Check if variable holds File or Blob

Question

Javascript has both File and Blob for file representation, and both are almost the same thing. Is there a way to check if a variable is holding a File or a Blob type of data?

Answer 1

W3.org:

'A File object is a Blob object with a name attribute, which is a string;'

In case of File:

var d = new Date(2013, 12, 5, 16, 23, 45, 600);
var generatedFile = new File(["Rough Draft ...."], "Draft1.txt", {type: 'text/plain', lastModified: d});

console.log(typeof generatedFile.name == 'string'); // true

In case of Blob:

var blob = new Blob();
console.log(typeof blob.name); // undefined

Condition:

var isFile = typeof FileOrBlob.name == 'string';