如何将字符串数据格式化为“1，fish#，15，bird#，4，horse#]”到“1，fish#15，bird#4，horse#”

Question

how to format string data like this '[1,fish#, 15,bird#, 4,horse#]' 

to '1，fish#15，bird#4，horse#'

Answer 1

您需要创建模型并将列表映射到模型

在您的例子中，您的模型类如下所示

class User  {
  final int user;
  final String tag;
  User({ required this.user, required this.tag, 
  
  });
}

像这样的列表

 final List<User> userlist = [User(user: 4, tag: "ahmed#"),User(user: 15, tag: "up#"),];

当您需要像这样使用数据时

userlist[0].tag,//0 is index

示例

print(userlist[0].tag,) //this will print  **ahmed#**

Answer 2

只需使用join和replaceAll。

export default function App() {
  const encode = (source: string[]): string => {
    return source.join(",").replaceAll("#,", "#");
  };

  const decode = (source: string): string[] => {
    return source
      .split(",")
      .reduce((p, n) => [...p, ...n.split("#")], new Array<string>())
      .map((e, i) => (i % 2 === 0 ? e : `${e}#`))
      .filter((e) => !!e);
  };

  let source = ["1", "fish#", "15", "bird#", "4", "horse#"];

  let sourceEncoded = encode(source);
  console.log("encode", sourceEncoded);
  // -> 1,fish#15,bird#4,horse# 

  let sourceDecoded = decode(sourceEncoded);
  console.log("decode", sourceDecoded);
  // -> ["1", "fish#", "15", "bird#", "4", "horse#"]

  return (
    <div className="App">
      ...
    </div>
  );
}

代码筛选箱示例(控制台)。

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