Parallel future example

parallel-future.js

let mkFuture = v => Future((reject, resolve) => {
  
  console.log(`start: ${v}`);

  setTimeout(() => {
    console.log(`resolve: ${v}`)
    resolve(v);
  }, Math.random() * 1000);
  
});

let futures = [1,2,3,4].map(mkFuture);
 
let safeErr = x => console.error(x);
let safeLog = x => console.log(x);

// Start in order, resolve in any order, emit array in order.
sequence(Future.of, futures).fork(safeErr, safeLog)