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:
matcher
,
if a single line exceeds this, the split stream will emit an error. split(JSON.parse, null, { maxLength: 2})
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) {
//each chunk now is a a js object
})
.on('error', function (err) {
//syntax errors will land here
//note, this ends the stream.
})
MIT