ioredis-mock/lib/commands/rpoplpush.js

This library emulates ioredis by performing all operations in-memory.

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.rpoplpush = rpoplpush;
function rpoplpush(source, destination) {
  if (this.data.has(source) && !(this.data.get(source) instanceof Array)) {
    throw new Error("Key " + source + " does not contain a list");
  }
  if (this.data.has(destination) && !(this.data.get(destination) instanceof Array)) {
    throw new Error("Key " + destination + " does not contain a list");
  }

  if (!this.data.has(source) || this.data.get(source).length === 0) {
    return null;
  }

  if (!this.data.has(destination)) {
    this.data.set(destination, []);
  }

  var newSource = this.data.get(source);
  var item = newSource.pop();

  var newDest = this.data.get(destination);
  newDest.unshift(item);

  this.data.set(source, newSource);
  this.data.set(destination, newDest);

  return item;
}