learnyounode 题解

//第三题

var fs =require('fs')
var path=process.argv[2]
fs.readFile(path,function(err,data){
var lines=data.toString().split('\n').length-1;
console.log(lines)
})

 

第5题

//new module program.js
var mymodule=require('./myfile.js')

var dir=process.argv[2]
var filter=process.argv[3]

mymodule(dir,filter,function(err,list){
    if(err)
        return console.error("ddddddd")

    list.forEach(function(file)
    {
        console.log(file)
    })
}) 

//myfile.js
var fs =require('fs')
var path=require('path')

module.exports=function(dir,fileter,callback)
{
    fs.readdir(dir,function(err,list){
        if(err)
            return callback(err)
        list=list.filter(function(file){
            if(path.extname(file)=='.'+fileter)
                return file
        })
        callback(null,list)
    })
}