Turn an output stream for a program into array

Question

I have an output stream for a program which contains list of available printers and I want to turn it into array.

This is my stdout:


OneNote                        

Microsoft XPS Document Writer  

Microsoft Print to PDF         

Fax

And I am seeking for a solution that will give me:

['OneNote', 'Microsoft XPS Document Writer', 'Microsoft Print to PDF', 'Fax']

I tried stdout.split('\n'), but it became

[
 'OneNote                        \r\r', 
 'Microsoft XPS Document Writer  \r\r', 
 'Microsoft Print to PDF         \r\r', 
 'Fax                            \r\r',
 '\r\r',
 ''
]

Then I tried stdout.split('\r\r\n') and it turns into

[
 'OneNote                        ', 
 'Microsoft XPS Document Writer  ', 
 'Microsoft Print to PDF         ', 
 'Fax                            ',
 '',
 ''
]

Now I can removes whitespace from ends of the strings stdout.split('\r\r\n').map(printer => printer.trim()) but I still need to filter out last two empty strings, so I was wondering is there any better/elegant way to solve the problem?

stdout.split('\r\r\n')
  .map(printer => printer.trim())
  .filter(printer => Boolean(printer.length))

trim() the string before splitting it

Patrick Evans
– Patrick Evans

2019-06-08 18:32:02 +00:00
Commented Jun 8, 2019 at 18:32 — Patrick Evans
– Patrick Evans, Commented Jun 8, 2019 at 18:32

Mulan · Accepted Answer · 2019-06-08 18:43:09Z

1

You can use a regular expression -

input.trim().split(/\s*[\r\n]+\s*/)

See it working in this complete program below -

const input = 
`
OneNote                        

Microsoft XPS Document Writer  

Microsoft Print to PDF         

Fax                            
`

const output =
  input.trim().split(/\s*[\r\n]+\s*/)
  
console.log(output)
// [
//   "OneNote",
//   "Microsoft XPS Document Writer",
//   "Microsoft Print to PDF",
//   "Fax"
// ]

The regular expression targets any carriage returns \r and/or line feeds \n surrounded by optional whitespace. It can be understood as -

\s* - zero-or-more whitespace, followed by
[\r\n]+ - one-or-more \r or \n, followed by
\s* - zero-or-more whitespace

edited Jun 8, 2019 at 18:43

answered Jun 8, 2019 at 18:35

Mulan

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