node.js - save file from array using fs without seperator -

i have problem save array file, don't way getting ',' separator in new file assuming means new row in array. example have file

this file text check

i read file save array make modification , want save file.

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

when getting new file ,

,this file ,with text ,to check

when try 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 , t, question how ride separator?

use join instead of map

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

writefile expects string, buffer, or uint8array data. implicitly call tostring() on array, why you'll commas.

How Y