Dart get file extension

Flutter has an inbuilt library called path. We can use it to find out the extension easily.

When you need to open DART files, start by double-clicking it.

Write to a file To write a string to a file, use the writeAsString method : import ‘dart:io’; void main() async { final filename = ‘file. txt’; var file = await File(filename). writeAsString(‘some content’); // Do something with the file. }