save file from array using fs without seperator

Question

I have problem to save array to file, I don't now way I always getting ',' separator in new file that I assuming means new row in array. So for example I have file

this is file
with text
to check

I read this file save to array make some modification and then I want to save this file.

 fs.writeFile('to_save', file.map(function(x){return x + '\n'}));

When I do like that I always getting new file with ,

,this is file
,with text
,to check

when I try to remove firs letter using

fs.writeFile('to_save', file.map(function(x){return x = x.substring(1, x.length) + '\n'}));

It remove me t, w and t, so my question is how to get ride this separator?

baao · Accepted Answer · 2017-08-18 19:34:56Z

4

Use join instead of map

fs.writeFile('to_save', file.join("\n"));

writeFile expects a string, a buffer, or an Uint8Array as data. It will implicitly call toString() on an array, which is why you'll get the commas.

edited Aug 18, 2017 at 19:34

answered Aug 18, 2017 at 19:11

baao

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3 Comments

cyprian Over a year ago

so why join is working, if still writeFile will call toString() ?

baao Over a year ago

It will implicitly call toString() on an array, join returns a string

cpres Over a year ago

For the record this also worked for my appendFile needs: fs.appendFile('file_name.txt', data.join("\n"), function (err) {}...

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