Hi Peng
Ideally you'd want to avoid using the Sync versions of these functions as
they block the system. Here is an example of how you can write to the file
after a read has completed. By passing a function as a callback to be run
when the function has completed.
var fs = require("fs");
console.log("starting read...")
fs.readFile("./test.txt", (err,data)=>{
if (err) {console.log(err); return;}
console.log("read is completed.")
console.log(data.toString())
var newdata = "some new data timestamp:"+new Date()
console.log("starting write...")
fs.writeFile("./test.txt", newdata, (err)=>{
if (err) {console.log(err); return;}
console.log("write success")
})
})
On Wednesday, 23 October 2019 17:45:02 UTC+2, Peng Yu wrote:
>
> I'd like to fs.writeFileSync() to the same file after reading its content
> by fs.readFileSync(). It is not clear to me whether fs.closeSync() (or any
> other file closing function) is needed between writeFileSync() and
> readFileSync() according to the documentation. Would you please let me
> know? Thanks.
>
> https://nodejs.org/api/fs.html
>
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