In the code below, content1 becomes undefined. I want it to equal 11111
const fs = require('fs');
fs.writeFile('./1.txt','11111',function(err,data{
var content1 = fs.readFile('./1.txt',function(err,data){
console.log(content1);
});
});
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2 Answers
readFile do not have a return value.
The contents of the read file will be in the parameter data of the callback function. You should also include the encoding in the options param so you can write/print the contents as text.
const fs = require('fs');
fs.writeFile('./1.txt','11111','utf8',function(err,data){
fs.readFile('./1.txt','uft8',function(err, content1){
console.log(content1);
});
});
Comments
Two things are actually missing in your code:
1- writeFile and readFile functions are both asynchronous the result is only accessible by a callback function or a promise if it is handled, so in the code below we are accessing the result using callback function.
2- Consider using 2 different names for the callback result from writeFile and readFile as you are using data in both of them.
try this:
const fs = require('fs');
fs.writeFile('./1.txt', '11111', function(err, writeData) {
fs.readFile('./1.txt', "utf8", function(err, readData) {
console.log(readData);
});
});
