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Dart| Flutter: Convert List into String examples


How to Convert List into String in Dart and Flutter

This tutorial shows multiple ways to create an immutable list.

Sometimes, You need to Convert List<String> into a Single String.

How to Convert List to String in Dart?

There are multiple ways we can do

  • use join() method

List has a join method that returns the string with an optional separator. default optional parameter is empty.

It iterates each element and calls the element.toString() append the result with a separator.

List.join(optionalSeparator)

Here is a program.

void main() {
  List<String> words = ["one", "two", "three"];
  print(words);
  print(words.join());
  print(words.join(" "));
  print(words.join("-"));
}

Output:

[one, two, three]
onetwothree
one two three
one-two-three
  • use reduce() method

The list has reduce() function, which reduces the list of elements into a single element.

iterates the element in a list and applies a function, function append the string, return the string.

String reduce(String Function(String, String) combine)

Here is an example

void main() {
  List<String> words = ["one", "two", "three"];
  print(words);
  String result = words.reduce((value, element) => value + '-' + element);
  print(result);
}

Output:

[one, two, three]
one-two-three
  • using for index loop

This is another to iterate the list of elements using for index loop append to an already declared variable, Finally print the variable to a console

Here is an example

void main() {
  List<String> words = ["one", "two", "three"];
  print(words);
  var result = "";
  for (int i = 0; i < words.length; i++) {
    result = result + words[i].toString();
  }
  print(result);
}

Output:

[one, two, three]
onetwothree

Conclusion

Learned multiple ways to join and convert a list to a single string in dart or flutter with examples.

  • join
  • reduce method
  • for index loop

For string joining, join is simple and easy to implement.

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