Write an array into an file fs

Question

I want to create a .txt file which contains my array, using fs.

My array looks like this:

const array = [1111, 2222, 33333]

The code below allows me to write in the file and seperate each entry with a comma but I cant get them on a new line. Neither using \n nor \r\n

await fs.writeFile('Participants.txt', `${array}, \r\n`);

Thanks for your help in advance.

@pilchard I have read somewhere that this can cause problems with bigger arrays — N0rmal
– N0rmal, Commented May 17, 2022 at 19:14
You indicate that you have an array with three elements in it. — pilchard
– pilchard, Commented May 17, 2022 at 20:12

Jack Lankford · Accepted Answer · 2022-05-17 18:30:09Z

1

Is something like this what you are looking for?

const array = [1111, 2222, 33333]
var arrayLength = array.length;
for (var i = 0; i < arrayLength; i++) {
    fs.appendFile('Participants.txt', `${array[i]}\n`);
}

edited May 17, 2022 at 18:30

answered May 17, 2022 at 18:23

Jack Lankford

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slebetman · Accepted Answer · 2022-05-17 18:30:28Z

0

What you are looking for is array.join():

const text_string = eligible.join('\n');

await fs.writeFile('Participants.txt', text_string);

In the example above I separated out the string you want to write to the file into a variable for clarity so that it is obvious what's going on. Of course you could skip the extra variable and just do eligible.join('\n') directly in the fs.writeFile() but I wanted to make it clear that this feature has nothing to do with fs nor any string syntax nor any function argument syntax. It is simply a feature of Arrays.

answered May 17, 2022 at 18:30

slebetman

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1 Comment

slebetman Over a year ago

You may also be interested in the opposite of .join() which is .split(). While .join() merges an array into a string .split() breaks up a string into an array.

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