将`fs.readdir`与`.then`链接以返回数组 [英] chaining `fs.readdir` with a `.then` to return an array

问题描述

我正在尝试在目录中创建特定文件的数组；它将通过一些测试用例来确保它符合给定的标准.

I am trying to create an array of specific files in a directory; which will go through a few test cases to make sure it fits a given criteria.

我正在使用fs.readdir方法，但是它没有返回promise，这意味着我不能push到array.

I'm using the fs.readdir method, but it doesn't return a promise meaning I cannot push to an array.

我的想法是用我实际要输出的文件填充一个数组(arr)，然后对该数组进行处理.但是因为readdir是异步的，并且我不能将.then()链接到它，所以我的计划被取消了.

My idea was to populate an array (arr) with the files I actually want to output and then do something with that array. But because readdir is asynchronous and I can't chain a .then() onto it, my plans are quashed.

我也尝试过使用readdirSync进行相同的操作，但无济于事.

I've also tried the same thing with readdirSync to no avail.

const Promise = require('bluebird');
const fs = Promise.promisifyAll(require('fs'));

var arr = [];

fs.readdirAsync(folder).then( files => {
  files.forEach(file => {
    fs.stat(folder + '/' + file, (err, stats) => {
       if(!stats.isDirectory()) {
         arr.push(file);
        return;
      }
     });
   });
})
.then( () => {
  console.log(arr);
});

推荐答案

我知道了；我只需要使用statSync而不是stat

I figured it out; I just needed to use statSync instead of stat

const fs = require('fs');

var arr = [];

var files = fs.readdirSync(folder);

files.forEach(file => {
  let fileStat = fs.statSync(folder + '/' + file).isDirectory();
  if(!fileStat) {
    arr.push(file);
  }
});

console.log(arr);

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