Hi. Through out my javascript hacking I see little awful patterns. Here are some of them.

switch (trafficLight) {
    case 'red':
        stop();
        break;
    case 'yellow':
        finishIfInProgressOrWait();
        break;
    case 'green':
        go();
        break;
    default:
        throw new Error('color unknown');
}

⬆️ could be rewritten as ⬇️

var strategies = {
        red: stop,
        yellow: finishIfInProgressOrWait,
        green: go
    }, handleInvalidColor = function () {
        throw new Error('color unknown');
    }, strategy = strategies[trafficLight] || handleInvalidColor;

strategy();

⬆️ there we have another one, and ⬇ something often used for default values ️

strategy = strategies[light] || valueInCaseTheOtherIsFalsyLikeUndefined;

similarly to ⬆️ we can also do falsy checks ⬇️

maybeDoStuff && maybeDoStuff();

unlike ⬆️, ⬇️ works only for undefined

[valueOrUndefined].map(doStuff);

⬇️ last one

function either (f) {
    return {
        or: function (defaultValue) {
            try {
                var value = f();
                if (value !== undefined) {
                    return value;
                } else {
                    return defaultValue;
                }
            } catch (error){
                return defaultValue;
            }
        }
    };
}