function MovesWithPromises () {
  this.up = function (val) {
    new Promise((resolve) => {
      this.state.y += val;
      resolve();
    });
    return this;
  };

  this.down = function (val) {
    new Promise((resolve) => {
      this.state.y -= val;
      resolve();
    });
    return this;
  };

  this.right = function (val) {
    new Promise((resolve) => {
      this.state.x += val;
      resolve();
    });
    return this;
  };

  this.left = function (val) {
    new Promise((resolve) => {
      this.state.x -= val;
      resolve();
    });
    return this;
  };

  this.print = function () {
    return `x: ${this.state.x}, y: ${this.state.y}`;
  };

  this.state = {
    x: 0,
    y: 0,
  };
}