Let's play on the Promises

index.html

pre#log

Let's play on the Promises.markdown

Let's play on the Promises

A Pen by TOBY on CodePen.

License.

script.js

let double = (x) => x * x
  , plus = (x) => (y) => x + y
  , print = (x) => { 
    document.querySelector("#log")
      .appendChild(
        document.createTextNode(x + "\n"));
    return x;
  }

Promise.resolve(10)
  .then(print)
  .then(double)
  .then(print)
  .then(plus(10))
  .then(print);