javascript - 使用某种循环添加到字符串中

Question

我正在尝试创建一个商店命令，列出我通过另一个命令添加到商店的元素。我尝试使用 for 循环添加到字符串中，但我没有成功，因为由于某种原因，这些值是 undefined 。此时，我已切换到 forEach 尝试使其工作，但不是每个值都未定义，而是仅列出数据库中保存的 2 个项目中的 1 个。

我正在使用 Enmap 来存储商店元素。

我使用 .filter() 函数过滤商店商品，该函数返回 Enmap( map )

预期行为:该命令正确列出商店中的所有商品(在本例中为 2 件商品)及其所有值

实际行为:嵌入内容仅显示 1/2 的项目。

const Discord = require('discord.js');
module.exports = {
    id: 'shop',
    aliases: ['buythings', 'linkcoinshop', 'edward'],
    channels: 'guild',
    exec: async (call) => {
        try {

            let filter = await call.client.shopData.filter(find => {
                return find.guildID === call.message.guild.id && find.forSale === true
            });
            if(filter.size === 0) return call.message.channel.send(`There are no items for sale right now.`)
            let embedDesc = '';
            console.log(filter)
                filter.forEach(found => {
                    embedDesc += `**__${found.itemName}__** \nDescription: ${found.itemDesc} \nCost: ${found.itemCost} \nQuantity: ${found.itemQuan} \n\n` 
                })
            const linkCoin = call.client.emojis.get('670675326837194782');
            const shopEmbed = new Discord.RichEmbed()
            .setTitle(`${linkCoin} LinkCoins Shop`)
            .setColor('BLURPLE')
            .setDescription(embedDesc);
            //.setDescription(`🔷: **__Diamond Role__** \nDescription: Gives access to diamond only perks including special giveaways and more! \nCost: 1500${linkCoin} \nQuantity: ♾️ \n\n 💠: **__Diamond + Role__** \nDescription: Access to all perks that Diamond gets you, but with extra abilities such as your own personal voice chats. \n`)
            call.message.channel.send(`Click on the reactions below to purchase.`)
            call.message.channel.send(shopEmbed)
        } catch(error) {
            call.message.channel.send(`Oops! That was an error! The issue has been reported to the adminstration team`);
            console.log(error);
        }
    }
}; 

如果有人对更好的方法有任何建议，或者只是使这项工作有效的方法，请告诉我。谢谢!

Answer 1

始终创建最少量的代码来说明您的问题。它使人们更容易帮助您，并且一旦您提取并隔离问题，8/10 的情况下您将自己解决问题。

听起来像:如何将对象数组转换为包含对象属性列表的字符串？

看起来您想这样做？

filter.reduce((prev, found) => `${prev}**__${found.itemName}__** \nDescription: ${found.itemDesc} \nCost: ${found.itemCost} \nQuantity: ${found.itemQuan} \n\n`, '')

测试用例:

const filter = [
  {
    itemCost: 5,
    itemName: 'snt',
    itemDesc: 'desc',
    itemQuan: 8
  },
  {
    itemCost: 3,
    itemName: 'another',
    itemDesc: 'desc2',
    itemQuan: 10
  }
]
console.log(
  filter.reduce(
    (prev, found) =>
      `${prev}**__${found.itemName}__** \nDescription: ${found.itemDesc} \nCost: ${found.itemCost} \nQuantity: ${found.itemQuan} \n\n`,
    ''
  )
)

输出:

➜ t test.ts
**__snt__** 
Description: desc 
Cost: 5 
Quantity: 8 

**__another__** 
Description: desc2 
Cost: 3 
Quantity: 10 

这应该与 Enmap 一起使用。每the API Docs :

enmap.reduce(fn, [initialValue]) ⇒ *
Identical to Array.reduce().