async.mjs

import fs from "node:fs/promises";
// ASYNC COMPARATOR
async function fileComparator(feedOne,feedTwo){
    try {
        if (!await access(feedOne,feedTwo)) {
            console.log(`file does not exist`)
        }
        const [fileOne,fileTwo]=await Promise.all([
            fs.readFile(feedOne,{encoding:'utf8'}),
            fs.readFile(feedTwo,{encoding:'utf8'})
        ])
        //()regular expression for split
        const arrayOne=fileOne.split('/\\s+/ ')
        const arrayTwo=fileTwo.split(' /\\s+/')
        const min=Math.min(arrayOne.length,arrayTwo.length)
        for (let index= 0; index < min; index++) {
            const elementOne=arrayOne[index]
            const elementTwo=arrayTwo[index]
            if (elementOne!==elementTwo) {
                await writing(`${elementOne} ${elementTwo}`)
                if ((index==min-1)&&arrayOne.length>min){
                    const removed=arrayOne.slice(min).join(' ')
                    await writing(removed)
                }
                else if((index==min-1)&&arrayTwo.length>min){
                    const removed=arrayTwo.slice(min).join(' ')
                    await writing(removed)
                }
            }
        }
    } catch (error) {
        console.log(`error in comperator ${error}`)
}
}
async function access(fileOne,fileTwo) {
    try {
        await fs.access(fileOne,fs.constants.R_OK)
        await fs.access(fileTwo,fs.constants.R_OK)
        return true
    } catch  {
        console.log(`error no access `)
        return false
    }
}
async function writing(params) {
    try {
        const path='./project1/diference.txt'
        const content=params
        if (await filePath(path)) {            
            await fs.appendFile(path,content)
        } else{
            await fs.writeFile(path,content)
        }
        
    } catch (error) {
        console.log(`error writing  ${error}`);
        
    }
}
async function filePath(path) {
    try {
    await fs.access(path)
    return true
    } catch {
    return false
    }
} 
fileComparator('./project1/txt/boom.txt','./file-system/copt.txt')