How to concatenate two strings in a dart?| Flutter By Example

Learn how to concatenate two strings in Dart and flutter programming with examples.

In Java languages, you can use the + symbol or the append method used to append strings.

Since String is an immutable object. There are multiple ways we can append strings.

#String concatenate or append in dart

For example, if given strings(str1=Hello, Str2=John) are appended, then the output is hello John`.

-using + operator

The + symbol appends the first string with the second string and the result is appended string.

It is simple and easy.

  void main() {
  var str = "Hello";
  var str1 = " John";

  print(str + str1); // Hello John
}

• string interpolation:

In this, the String variable is appended with $ and enclosed in single quotes. if a string variable is str, you can use either one of '$str' and '${str}'

void main() {
  var str = "Hello";
  var str1 = " John";
  print('$str $str1'); // Hello John

  print('${str}${str1}'); // Hello John
}

Since the string is immutable, string interpolation is recommended over the + symbol.

• StringBuffer class

The StringBuffer class can be used for complex string object creation over String object.

It has a method write() for append a string, writeAll() for Iterable String Finally, Returns theStringbuffer toString() method.

Here is an example code

void main() {
  var str = "Hello";
  var str1 = " John";
  final sb = StringBuffer();
  sb.write(str);
  sb.write(str1);

  print(sb.toString()); // Hello John
}

#Conclusion

Learned multiple ways to append a string with another string using plus operator, String interpolation and StringBuffer write method.