How to convert string to List in Flutter (dart string to list int): This concise article shows you how to convert a string or a number (integer or double) to a byte array (a list of bytes) in Dart (and Flutter as well).
Converting a String into a Byte Array
There is more than one way to turn a given string into a byte array in Dart(Convert int to list in Dart).
Dart string to list int : Using the utf8.encode() method
The utf8.encode() method (which can be imported from dart:convert) takes a string and return a list of UTF-8 bytes.
Example:
// main.dart
import 'dart:convert';
void main() {
String text = 'KindaCode.com';
List<int> bytes = utf8.encode(text);
print(bytes);
}Output:
[75, 105, 110, 100, 97, 67, 111, 100, 101, 46, 99, 111, 109]Using the codeUnits property of the String class
The codeUnits property of the String class returns a list of UTF-16 code units.
Example:
// main.dart
void main() {
String text = 'KindaCode.com';
List<int> bytes = text.codeUnits;
print(bytes);
}75, 105, 110, 100, 97, 67, 111, 100, 101, 46, 99, 111, 109]Using the runes property of the String class
The runes property gives you an iterable of Unicode code points of a string.
Example:
// main.dart
void main() {
String text = 'Welcome to KindaCode.com';
Iterable<int> bytes = text.runes;
// convert the iterable to a list
List<int> list = bytes.toList();
print(list);
}Output:
[87, 101, 108, 99, 111, 109, 101, 32, 116, 111, 32, 75, 105, 110, 100, 97, 67, 111, 100, 101, 46, 99, 111, 109]Converting a Number into a Byte Array
To convert a number to a byte array, you can first convert it to a string and then use one of the approaches mentioned in the previous section to get the job done.
Example:
// main.dart
import "dart:convert";
void main() {
// integer to byte array
int myInt = 2023;
print(utf8.encode(myInt.toString()));
// double to byte array
double myDouble = 3.1416;
print(utf8.encode(myDouble.toString()));
}Output:
[50, 48, 50, 51]
[51, 46, 49, 52, 49, 54]Flutter List<Object to String FAQs
How do you convert string to list int in Dart?
List lstring = [“1”, “2”]; List lint = lstring. map(int. parse). toList();
How do you split a string to a list in Dart?
In Dart splitting of a string can be done with the help split string function in the dart. It is a built-in function use to split the string into substring across a common character. This function splits the string into substring across the given pattern and then store them to a list.
What is parse() in Dart?
Contribute to Docs. In Dart, the . parse() method is used to convert a string representation of data into a specified data type.
Check Also : How to get Element at specific Index from List in Dart
Read more updates related to flutter at flutterfever.com.