MaxInterview - how to append to a file in node 3f

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1// Asynchronously:
2const fs = require('fs');
3
4fs.appendFile('message.txt', 'data to append', function (err) {
5  if (err) throw err;
6  console.log('Saved!');
7});
8
9// Synchronously:
10const fs = require('fs');
11
12fs.appendFileSync('message.txt', 'data to append');

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