打字稿将字符串转换为地图

Question

我有这个字符串（称为 currentExecution.variables）：

{executionid=0c3246fb37e65e3368c8c4f30000016ab593bec244daa8df, timeout=10000}

并且我需要将其转换为 Map 以便我可以处理这些条目，但我很难做到这一点。我已经尝试按照this answer 将其转换为一组键值对。首先，我将 = 替换为 : 并将 { 或 } 替换为空格，然后根据答案将其拆分：

newString.split(/,(?=[^,]+:)/).map(s => s.split(': '));

但我没有得到正确的结果，而且我在没有地图的情况下被困住了。少了什么东西？还是有更好/更快的方法来做到这一点？

Answer 1

您可以执行以下操作

1. 从字符串的开头和结尾删除{ 和} 字符。不要使用replace，以防其中有任何事件。
2. 将结果拆分为形成键值对的每个离散块。
3. 将它们拆分为实际的键和值
4. 结果可以很容易地转换为 Map，因为构造函数 takes an array where each item is an array with two items 会将结果转换为第一项是键，第二项是值的映射：

let string = "{executionid=0c3246fb37e65e3368c8c4f30000016ab593bec244daa8df, timeout=10000}";

let keyValuePairs = string.slice(1, -1) //remove first and last character
  .split(/\s*,\s*/)                     //split with optional spaces around the comma
  .map(chunk => chunk.split("="));      //split key=value
  
const map = new Map(keyValuePairs);

console.log(map.get("executionid"));
console.log(map.get("timeout"));

Answer 2

你也可以不使用正则表达式，但你必须先了解它的基本概念，然后沿着,s 拆分，然后沿着=s 拆分：

var data = "{executionid=0c3246fb37e65e3368c8c4f30000016ab593bec244daa8df, timeout=10000}";
var pairs = data.substring(1, data.length - 1).split(", "); // step 1, split using commas

var obj = pairs.reduce(function(acc, cur) {
  var pair = cur.split("="); // step 2, split using =
  acc[pair[0].trim()] = pair[1].trim();
  return acc;
}, {});

console.log(obj);

Answer 3

您可以在this regex 所示的捕获组中捕获键值对。

基于此，您可以继续将其值降低为 Map。

const currentExecutionVariable = "{executionid=0c3246fb37e65e3368c8c4f30000016ab593bec244daa8df, timeout=10000}";

const pattern = /([A-Za-z0-9]+)\=([A-Za-z0-9]+)/g;

const matches = currentExecutionVariable.match(pattern);

const currentExecutionMap = matches.reduce((acc, curr) => {
	const [key, value] = curr.split('=');
	
	if (!acc.has(key)) {
		acc.set(key, value);
	}	
	return acc;
}, new Map());

for (const [key, value] of currentExecutionMap.entries()) {
  console.log (`${key}: ${value}`);
}

---

更新

使用捕获的组：

const currentExecutionVariable = "{executionid=0c3246fb37e65e3368c8c4f30000016ab593bec244daa8df, timeout=10000}";

const pattern = /([A-Za-z0-9]+)\=([A-Za-z0-9]+)/g;

let currentExecutionMap = new Map();

let capturedGroup;
while ((capturedGroup = pattern.exec(currentExecutionVariable))) {

  // 1st captured group is the key of the map
  const key = capturedGroup[1];

  // 2nd captured group is the value of the map
  const value = capturedGroup[2];

  if (!currentExecutionMap.has(key)) {
    currentExecutionMap.set(key, value);
  }
}

for (const [key, value] of currentExecutionMap.entries()) {
  console.log(`${key}: ${value}`);
}

Answer 4

我有这个字符串（称为 stats）：

active_total: 1087
cumulative: 1
trace_total: 10

甚至不是 JSON 格式。

This 是我正在尝试的解决方案：

let keyValuePairs = stats
  .split(/\s*\n\s*/)                     //split with optional spaces around the comma
  .map(chunk => chunk.split(": "));      //split key=value
  
const map = new Map(keyValuePairs);

console.log(map.get("sessions_active_total"));
console.log(map.get("cumulative"));

但它在这一行抛出编译错误：

const map = new Map(keyValuePairs);

错误信息：

error TS2769: No overload matches this call.
  Overload 1 of 3, '(iterable: Iterable<readonly [unknown, unknown]>): Map<unknown, unknown>', gave the following error.
    Argument of type 'string[][]' is not assignable to parameter of type 'Iterable<readonly [unknown, unknown]>'.
      The types returned by '[Symbol.iterator]().next(...)' are incompatible between these types.
        Type 'IteratorResult<string[], any>' is not assignable to type 'IteratorResult<readonly [unknown, unknown], any>'.
          Type 'IteratorYieldResult<string[]>' is not assignable to type 'IteratorResult<readonly [unknown, unknown], any>'.
            Type 'IteratorYieldResult<string[]>' is not assignable to type 'IteratorYieldResult<readonly [unknown, unknown]>'.
              Type 'string[]' is not assignable to type 'readonly [unknown, unknown]'.
                Target requires 2 element(s) but source may have fewer.
  Overload 2 of 3, '(entries?: readonly (readonly [unknown, unknown])[]): Map<unknown, unknown>', gave the following error.
    Argument of type 'string[][]' is not assignable to parameter of type 'readonly (readonly [unknown, unknown])[]'.
      Type 'string[]' is not assignable to type 'readonly [unknown, unknown]'.

58         const map = new Map(keyValuePairs);