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split - npm

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) {
      
    })
 

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 })

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.

split accepts a function which transforms each line.

fs.createReadStream(file)
  .pipe(split(JSON.parse))
  .on('data', function (obj) {
    
  })
  .on('error', function (err) {
    
    
  })

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