如何运行这个循环直到数组中没有更多的对象？

huangapple
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英文:

How do I run this loop until there are no more objects in the array?

问题

当数组达到 [] 时，我试图运行一个 while 循环，但它会崩溃。

这是我正在运行的代码：

  1. const mineflayer = require('mineflayer');
  2. let contas = require('./accounts');
  4. let fila = []
  6. function sleep(ms) {
  7.   return new Promise(resolve => setTimeout(resolve, ms));
  8. }
  10. function main() {
  11.   async function start(conta) {
  12.     await sleep(1000);
  13.     fila.logged = true;
  14.     fila.shift();
  15.   }
  17.   async function queueStarter() {
  18.     let loop = 1;
  19.     if (fila.length >= loop && fila.length != 'undefined') {
  20.       while (fila[0].logged == false) {
  21.         start(fila[0]);
  22.         await sleep(4000);
  23.       }
  24.     } else console.log('Reached array end')
  25.   }
  27.   for (key in contas) {
  28.     let conta = contas[key];
  29.     fila.push(conta);
  30.   }
  31.   queueStarter()
  32. }
  33. main();

这是控制台输出：

  1. PS C:\Users\Zwei\.vscode\IDKHowToCode> node .\StackExcample.js
  2. C:\Users\Zwei\.vscode\IDKHowToCode\StackExcample.js:20
  3.     while (fila[0].logged == false){
  4.                    ^
  6. TypeError: Cannot read properties of undefined (reading 'logged')
  7.     at queueStarter (C:\Users\Zwei\.vscode\IDKHowToCode\StackExcample.js:20:20)
  9. Node.js v18.12.1

我希望它在 fila 数组中没有更多对象时停止。为什么它在应该停止时没有停止呢？

英文:

I'm trying to run a while loop, but when the array reaches [], it crashes.

This is what I'm running:

  1. const mineflayer = require('mineflayer');
  2. let contas = require('./accounts');
  4. let fila = []
  6. function sleep(ms) {
  7.   return new Promise(resolve => setTimeout(resolve, ms));
  8. }
  10. function main() {
  11.   async function start(conta) {
  12.     await sleep(1000);
  13.     fila.logged = true;
  14.     fila.shift();
  15.   }
  17.   async function queueStarter() {
  18.     let loop = 1;
  19.     if (fila.length >= loop && fila.length != 'undefined') {
  20.       while (fila[0].logged == false) {
  21.         start(fila[0]);
  22.         await sleep(4000);
  23.       }
  24.     } else console.log('Reached array end')
  25.   }
  27.   for (key in contas) {
  28.     let conta = contas[key];
  29.     fila.push(conta);
  30.   }
  31.   queueStarter()
  32. }
  33. main();

This is the console:

  1. PS C:\Users\Zwei\.vscode\IDKHowToCode> node .\StackExcample.js
  2. C:\Users\Zwei\.vscode\IDKHowToCode\StackExcample.js:20
  3.     while (fila[0].logged == false){
  4.                    ^
  6. TypeError: Cannot read properties of undefined (reading 'logged')
  7.     at queueStarter (C:\Users\Zwei\.vscode\IDKHowToCode\StackExcample.js:20:20)
  9. Node.js v18.12.1

What I want is for it to stop when there are no more objects in the 'fila' array.

Why is it not stopping when it should?

答案1

得分: 0

@Barmar 建议了这个修复方法，而且它有效 如何运行这个循环直到数组中没有更多的对象？

在 queueStarter 函数中，将以下代码段：

while (fila[0].logged == false) {

修改为：

while (fila[0] && fila[0].logged == false){

这样会检查 fila[0] 是否存在并且是否已经被记录。

英文:

@Barmar suggested this fix and it works 如何运行这个循环直到数组中没有更多的对象？

on the queueStarter function, changing

while (fila[0].logged == false) {

to

while (fila[0] && fila[0].logged == false){

makes it check if there's something on fila[0] and if it's logged.

huangapple
  • 本文由 发表于 2023年1月11日 01:52:14
  • 转载请务必保留本文链接：https://go.coder-hub.com/75073972.html
  • arrays
  • javascript
  • node.js
  • while-loop
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