How to concatenate two string in Dart?

In Dart, there are several common methods for concatenating strings, including the use of the plus (+) operator and string interpolation. Below, I will detail these two methods with examples.

1. Using the Plus (+) Operator

This is the most straightforward approach, similar to many other programming languages, where you can use the plus (+) operator to concatenate two strings.

Example:

dart
String firstName = "张";
String lastName = "三";
String fullName = firstName + lastName;
print(fullName); // Output: 张三

In this example, the firstName and lastName strings are concatenated using the plus operator to form fullName.

2. Using String Interpolation

String interpolation is a more powerful and flexible method for concatenating strings. You can directly embed variables or expressions within a string by preceding them with the $ symbol. For complex expressions, wrap them in ${}.

Example:

dart
String firstName = "张";
String lastName = "三";
String fullName = "$firstName$lastName";
print(fullName); // Output: 张三

In this example, $firstName and $lastName are directly embedded into the new string to form fullName. This approach makes the code more concise and improves readability.

Conclusion

In practical development, it is recommended to use string interpolation as it is more concise and easier to read and maintain. However, for simple string concatenation tasks, using the plus operator is also viable. The choice depends on the specific context and personal preference.