Convert a push-filter to a pull-filter (for simple streams)
Usage is simple. Define your filter as an (emit) -> emit
transform where emit
is (err, item)
. Then when you need an (stream) -> stream
filter, use this module to convert it.
var pushToPull = require('push-to-pull');
// Dumb filter that inputs numbers and outputs that many monkeys
// Encoded as an (emit) -> emit transform filter.
function pushFilter(emit) {
return function (item) {
if (item === undefined) return emit();
for (var i = 1; i <= item; i++) {
emit("MONKEY " + i);
}
}
}
// Same filter, but as a (stream) -> stream transform filter
var pullFilter = pushToPull(pushFilter);