bcn-filter

BcnFilter is an iterator that provides a way to filter and simplify iterators.

Installation

npm install bcn-filter

var filter = new BcnFilter(iterator, filterFunction);
var asyncFilter = new BcnFilter(iterator, asycFilterFunction, {async: true});

filterFunction(key, value) -> [key, value] | null (ignore value) asyncFilterFunction(key, value, cb) -> cb([key, value]) | cb(null) (ignore value)

You can use this to rewrite streams by ignoring certain elements or transforming values on the fly.

Filter function that does nothing

function filterNone(key, value) {
	return [key, value];
}

Filter some elements

function filterJustGood(key, value) {
	return value.isGood ? [key, value] : null;
}

Methods

pause()

Pauses iterator

resume()

Resumes iterator

Events

data(key, value)

outputs the filtered value

end

emitted when finished