Up/Down Switch

gistfile1.txt

[
    {
        "id": "03d1fe605e7ed494",
        "type": "subflow",
        "name": "UD Switch",
        "info": "Up/Down Switcher",
        "category": "",
        "in": [
            {
                "x": 244,
                "y": 272,
                "wires": [
                    {
                        "id": "2b906dcad292535c"
                    }
                ]
            }
        ],
        "out": [
            {
                "x": 516,
                "y": 240,
                "wires": [
                    {
                        "id": "2b906dcad292535c",
                        "port": 0
                    }
                ]
            },
            {
                "x": 516,
                "y": 304,
                "wires": [
                    {
                        "id": "2b906dcad292535c",
                        "port": 1
                    }
                ]
            }
        ],
        "env": [
            {
                "name": "initial",
                "type": "str",
                "value": "up",
                "ui": {
                    "icon": "font-awesome/fa-arrows-v",
                    "label": {
                        "en-US": "Initial"
                    },
                    "type": "select",
                    "opts": {
                        "opts": [
                            {
                                "l": {
                                    "en-US": "Up"
                                },
                                "v": "up"
                            },
                            {
                                "l": {
                                    "en-US": "Down"
                                },
                                "v": "down"
                            }
                        ]
                    }
                }
            }
        ],
        "meta": {
            "author": "Oleg Koltsov",
            "desc": "Up/Down Switcher",
            "keywords": "switcher"
        },
        "color": "#DDAA99",
        "outputLabels": [
            "▲ Up",
            "▼ Down"
        ],
        "icon": "node-red/switch.svg",
        "status": {
            "x": 516,
            "y": 368,
            "wires": [
                {
                    "id": "d7dc04e4535169a8",
                    "port": 0
                }
            ]
        }
    },
    {
        "id": "2b906dcad292535c",
        "type": "function",
        "z": "03d1fe605e7ed494",
        "name": "",
        "func": "let state = context.get('state')\n\nif (state === undefined) {\n    state = env.get('initial') == 'up'\n}\n\nnode.status({fill:\"green\", shape:\"dot\", text:state ? \"▲\" : \"▼\"})\n\ncontext.set('state', !state)\n\nif (state) {\n    return [msg, null]\n} else {\n    return [null, msg]\n}",
        "outputs": 2,
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
        "x": 380,
        "y": 272,
        "wires": [
            [],
            []
        ],
        "outputLabels": [
            "▲ Up",
            "▼ Down"
        ]
    },
    {
        "id": "d7dc04e4535169a8",
        "type": "status",
        "z": "03d1fe605e7ed494",
        "name": "",
        "scope": [
            "2b906dcad292535c"
        ],
        "x": 380,
        "y": 368,
        "wires": [
            []
        ]
    },
    {
        "id": "8b596f84b0bf7b80",
        "type": "subflow:03d1fe605e7ed494",
        "z": "2ba8e4446e979585",
        "name": "",
        "x": 396,
        "y": 720,
        "wires": [
            [],
            []
        ]
    }
]