string 如何在 Dart 中连接两个字符串？
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How to concatenate two string in Dart?
提问by ASHWIN RAJEEV
I am new to Dart programming language and anyone help me find the best string concatenation methods available in Dart.
我是 Dart 编程语言的新手，任何人都可以帮助我找到 Dart 中可用的最佳字符串连接方法。
I only found the plus (+) operator to concatenate strings like other programming languages.
我只发现加号 (+) 运算符可以像其他编程语言一样连接字符串。
回答by Günter Z?chbauer
There are 3 ways to concatenate strings
有3种连接字符串的方法
String a = 'a';
String b = 'b';
var c1 = a + b; // + operator
var c2 = '$a$b'; // string interpolation
var c3 = 'a' 'b'; // string literals separated only by whitespace are concatenated automatically
var c4 = 'abcdefgh abcdefgh abcdefgh abcdefgh'
'abcdefgh abcdefgh abcdefgh abcdefgh';
Usually string interpolation is preferred over the +operator.
通常字符串插值优于+运算符。
There is also StringBufferfor more complex and performant string building.
还有用于更复杂和高性能的字符串构建的StringBuffer。
回答by M. Syamsul Arifin
If you need looping for concatenation, I have this :
如果你需要循环连接，我有这个：
var list = ['satu','dua','tiga'];
var kontan = StringBuffer();
list.forEach((item){
kontan.writeln(item);
});
konten = kontan.toString();
回答by Baig
Easiest way
最简单的方法
String get fullname {
var list = [firstName, lastName];
list.removeWhere((v) => v == null);
return list.join(" ");
}
回答by Yogendra Singh
Suppose you have a Person class like.
假设你有一个 Person 类。
class Person {
String name;
int age;
Person({String name, int age}) {
this.name = name;
this.age = age;
}
}
And you want to print the description of person.
并且您想打印人员的描述。
var person = Person(name: 'Yogendra', age: 29);
Here you can concatenate string like this
在这里你可以像这样连接字符串
var personInfoString = '${person.name} is ${person.age} years old.';
print(personInfoString);
