split

split a Text Stream into a Line Stream

  • split

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split
1.0.17 years ago12 years agoMinified + gzip package size for split in KB

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Split (matcher)
build status
Break up a stream and reassemble it so that each line is a chunk. matcher may be a String, or a RegExp
Example, read every line in a file ...
fs.createReadStream(file)
  .pipe(split())
  .on('data', function (line) {
    //each chunk now is a separate line!
  })

split takes the same arguments as string.split except it defaults to '/\r?\n/' instead of ',', and the optional limit parameter is ignored. String#split
split takes an optional options object on its third argument.
split(matcher, mapper, options)

Valid options:
  • maxLength - The maximum buffer length without seeing a newline or matcher,
if a single line exceeds this, the split stream will emit an error.
split(JSON.parse, null, { maxLength: 2})

  • trailing - By default the last buffer not delimited by a newline or matcher will be emitted. To prevent this set options.trailing to false.

split(JSON.parse, null, { trailing: false })

keep matched splitter

As with String#split, if you split by a regular expression with a matching group, the matches will be retained in the collection.
stdin
.pipe(split(/(\r?\n)/))
... //lines + separators.
NDJ - Newline Delimited Json
split accepts a function which transforms each line.
fs.createReadStream(file)
  .pipe(split(JSON.parse))
  .on('data', function (obj) {
    //each chunk now is a a js object
  })
  .on('error', function (err) {
    //syntax errors will land here
    //note, this ends the stream.
  })
License
MIT