删除行首的“，” CSV

Question

i want to convert a.csv file and write a new one. However I am not able to remove the first, i am kinda stuck here and it is driving me crazy. This is my code:

    var extractedtasks = tasks.slice(0, 3)
    var extractedtasksformated = extractedtasks.toString().replace(/,$/g, "\n")

    let csvformat = "EMAIL,PASSWORD,MAILBOX"
    fs.writeFileSync(tasklocation[0], csvformat + "\n" + extractedtasksformated.replace(/,^/g, 
    ""))
    console.log(chalk.green("Successfully updated the CSV file"))

That's the output i am getting in the newly generated file

EMAIL,PASSWORD,MAILBOX
example1@gmail.com,Password123,example@gmail.com:password
,example2@gmail.com,Password123,example@gmail.com:password
,example3@gmail.com,Password123,example@gmail.com:password

Output extractedtasks:

[
  'example1@gmail.com,Password123,example@gmail.com:password\r',
  'example2@gmail.com,Password123,example@gmail.com:password\r',
  'example3@gmail.com,Password123,example@gmail.com:password\r'
]

Output extractedtasksformated:

,example3@gmail.com,Password123,example@gmail.com:passwordxample@gmail.com:password

Answer 1

Because extractedtasks is an array, instead of converting it to a string you should just join it with the expected separator:

extractedtasks = [
  'example1@gmail.com,Password123,example@gmail.com:password\r',
  'example2@gmail.com,Password123,example@gmail.com:password\r',
  'example3@gmail.com,Password123,example@gmail.com:password\r'
]

extractedtasksJoined = extractedtasks.join("\n")
// "example1@gmail.com,Password123,example@gmail.com:password\r\nexample2@gmail.com..."

// depending on the target line separator, you should also probably
// remove the "\r"
extractedtasksJoined = extractedtasksJoined.replace("\r", "")

// finally
fs.writeFileSync(tasklocation[0], csvformat + "\n" + extractedtasksJoined + "\n")