A Collection of Code Snippets in as Many Programming Languages as Possible
This project is maintained by TheRenegadeCoder
Welcome to the File Input Output in Javascript page! Here, you'll find the source code for this program as well as a description of how the program works.
//Written with node 10.16.3
//fs.promises API is still experimental in Node at this time, but it should be preferred over callbacks when is fully developed
fs = require('fs');
const filepath = './output.txt'; //create tempfile.txt in this directory
const text = `The quick brown fox jumped over the lazy pupper
The quick brown fox jumped over the lazy dog
The quick brown fox jumped over the lazy doggo
The quick brown fox jumped over the lazy floof`;
function writeFile(){
fs.writeFile(filepath,text, readFile); //passes writing errors to the callback function, readFile
}
function readFile(err){
if(err) return console.log(err);
//fs.readFile is called with 'utf8' option, so the output is a string instead of a buffer
fs.readFile(filepath,'utf8',printString); //passes (err, string) to the callback function, printString
}
function printString(err, data){
if(err) return console.log(err);
console.log(data);
}
writeFile();
File Input Output in Javascript was written by:
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