stream-reduce

Like Array.prototype.reduce but for streams. Given a sync reduce function and an initial value it will return a through stream that emits a single data event with the reduced value once the input stream ends.

Example

var reduce = require("stream-reduce");
 
process.stdin.pipe(reduce(function(acc, data) {
    return acc + data.length;
}, 0)).on("data", function(length) {
    console.log("stdin size:", length);
});

Installation

npm install stream-reduce