Rewind hypertrie

index.js

const ram = require("random-access-memory");
const hypertrie = require("hypertrie");
const db = hypertrie(ram);

let xItems = ["little", "bits", "of", "info"].map(
  item => ({
    type: "put",
    key: "/x",
    value: item
  })
);

let yItems = ["1", "2", "3", "4"].map(item => ({
  type: "put",
  key: "/x/y",
  value: item
}));

db.batch(xItems.concat(yItems), function() {
  let history = db.history({ reverse: true });
  for (let i = db.version; i--; i > 1) {
    history.next((_, obj) => {
      if (obj && obj.key === "x") {
        console.log(
          obj.seq,
          obj.key,
          obj.value.toString(),
          obj.hash.toString("hex")
        );
      }
    });
  }
});