Dart: Scalable Application Development

Writing to a file

In this recipe, we demonstrate the three most important ways to write to a file. You can find the code in the project writing_files.

How to do it...

The three ways to write to a file are discussed as follows:

1. First, we import the packages io and convert as shown in the following code:

   import 'dart:io';
   import 'dart:convert';
   
   void main() {

2. We can write to a file using writeAsString as shown in the following code:

     final filename = 'outString.txt';
     new File(filename).writeAsString('Dart is an elegant language').then((File file) {
     // do something with the file.
   });

3. We can write to a file using writeAsBytes as shown in the following code:

     final string = '你好世界';
     // Encode to UTF8.
     var encodedData = UTF8.encode(string);
     new File('outUTF8.txt').writeAsBytes(encodedData).then((file) ...