Generated by XState Viz: https://xstate.js.org/viz

machine.js

 Machine({
  id: "electricFan",
  type: "parallel",
  states: {
    power: {
      id: "power",
      initial: "turnedOff",
      states: {
        turnedOff: {
          on: {
            PLUG: "turnedOn",
          },
        },
        turnedOn: {
          on: {
            UNPLUG: "turnedOff",
            BUTTON_0_PRESSED: "#speed.low",
            BUTTON_1_PRESSED: "#speed.low",
            BUTTON_2_PRESSED: "#speed.moderate",
            BUTTON_3_PRESSED: "#speed.high",
          },
        },
      },
    },
    speed: {
      initial: "zero",
      id: "speed",
      states: {
        zero: {},
        low: {
          on: {
            UNPLUG: "#power.turnedOff",
            BUTTON_2_PRESSED: "moderate",
            BUTTON_3_PRESSED: "high",
          },
        },
        moderate: {
          on: {
            UNPLUG: "#power.turnedOff",
            BUTTON_1_PRESSED: "low",
            BUTTON_3_PRESSED: "high",
          },
        },
        high: {
          on: {
            UNPLUG: "#power.turnedOff",
            BUTTON_1_PRESSED: "low",
            BUTTON_2_PRESSED: "moderate",
          },
        },
      },
    },
  },
});