javascript - javascript 集合 - 向集合内对象中的数组添加值

Question

我正在尝试制作一组​​集合来制作这样的东西

{
    'user1': ["value#1", "value#2",..."value#N"],
    'user2': ["value#2",..."value#N"],
    'userN': [..."value#N"]
}

然后value#x在 5 秒后删除（例如）。

这是我的代码：

var myset = new Set();
var ran = myset[USERID] = commandNumber;

//i'm trying to make "if myset contains userNumber AND commandName" return, 
//if its not, run someFunction() and continue
if (myset.has(ran)) return;
someFunction();

myset.add(ran);
setTimeout(() => {
  myset.delete(ran);
}, 5000);

而不是像第一个代码那样得到输出，而是得到这个输出

Set { 'command1', 'command2',
'USER1': 'command3',
'USER2': 'command4'
'USERN': 'commandN'
}

如果您有任何问题，请随时发表评论，如果我的问题难以理解，请见谅

标签： javascriptarraysnode.jsobjectdiscord.js

Answer 1

不需要为此目的的 Set，但我做了一个小型 POC，可以帮助您实现所需的解决方案：

'use strict';

const mySet = new Set();
const mySetMetadata = {};

const removeFromSet = (userKey, commandName) => {
  const commands = mySetMetadata[userKey] || [];
  if (commands.includes(commandName)) {
    mySetMetadata[userKey] = commands.filter(c => c !== commandName);

    if (mySetMetadata[userKey].length === 0) {
      mySet.delete(userKey);
      mySetMetadata[userKey] = undefined;
    }
  }
};

/**
 * Add relation between an userKey and a command
 * @param {String} userKey
 * @param {Array} commands Array of commands
 */
const addToSet = (userkey, commands) => {
  mySet.add(userkey);

  if (typeof mySetMetadata[userkey] === 'undefined') {
    mySetMetadata[userkey] = commands;
  } else {
    mySetMetadata[userKey] = [...mySetMetadata[userKey], ...commands]
  }  
}

// Populate with demo data
addToSet('user1', ['value#1', 'value#2', 'value#N']);
addToSet('user2', ['value#2', 'value#N']);
addToSet('user3', ['value#N']);

// Set up a timeout for a given user + key
setTimeout(() => {
  removeFromSet('user1', 'value#2');
}, 5000);