文件数未正确计数 [英] Files number not counting properly

问题描述

我有一个包含 264420 个文件的目录

I have a directory with 264420 files

$ find /Users/Username -type f | wc -l
    264420

我正在尝试使用简单的counter++

I'm trying to count the file number recursively in Node.js with simple counter++

问题在于counter++提供的文件数量不正确，而array.push(file)最后带有array.length的文件可以正常工作，并提供正确数量的文件- 264420

The issue is that counter++ gives incorrect number of files, while array.push(file) with array.length in the end working just fine and gives back correct amount of files - 264420

$ node total-files.js

114 'total_files_count' 
264420 'total_files_array_count'

简化的脚本如下所示:

const fs = require('fs')
const path = require('path')
const dir = '/Users/Username'
let totalFiles = 0
let totalFilesArray = []

const totalFilesObj = getFilesRecursively(dir, totalFiles, totalFilesArray)

console.log(totalFilesObj.total_files, 'total_files_count', totalFilesObj.total_files_array.length, 'total_files_array_count')


function getFilesRecursively(dir, totalFiles, totalFilesArray){

    totalFiles = totalFiles || 0
    totalFilesArray = totalFilesArray || []  

    try { var files = fs.readdirSync(dir) }
    catch(err) { console.error(err.message)  }

    for (var i in files) {

        var name = path.join(dir, files[i])

        try {  

            let stats = fs.lstatSync(name)  // track symlink as link, but not as file

            if (stats.isDirectory()) 
                getFilesRecursively(name, totalFiles, totalFilesArray) 

            else if (stats.isFile()) {
                totalFiles++   // why this not working? so we should use .push to array instead?
                totalFilesArray.push(name) 
            }

        } catch(err) { console.error(err.message) }     
    }

    return { "total_files" : totalFiles, "total_files_array" : totalFilesArray }
}

我正计划在具有成千上万个文件的大型目录上运行脚本，并希望使用比推入数组要快的计数器增量.

I'm planning to run the script on large directories with hundreds of thousands of files and want to use counter incremental which is faster than pushing to array.

请帮助.

推荐答案

两个原因

• 您没有将递归的返回值添加到最终值.
• 增加原始值并不会在调用者函数的作用域内更改该值.

制作

if (stats.isDirectory()) 
{
     var returnVal  = getFilesRecursively(name, totalFiles, totalFilesArray);
     totalFiles +=  returnVal.total_files;
}

此外，在方法开始时将totalFiles值设置为0 .

Also, set the totalFiles value to 0 in the beginning of the method.

这篇关于文件数未正确计数的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！