Office Whisperer

var Chainsaw = require('chainsaw'); function AddDo (sum) { return Chainsaw(function (saw) { this.add = function (n) { sum += n; saw.next(); }; this.do = function (cb) { saw.nest(cb, sum); }; }); } AddDo(0) .add(5) .add(10) .do(function (sum) { if (sum > 12) this.add(-10); }) .do(function (sum) { console.log('Sum: ' + sum); }) ;