Function isPromise

docs/app/js/sanddance-app.js:55285–55287

(x)

    return isObject(x) && x.constructor === ({}).constructor;
};
var isPromise = function isPromise(x) {
    return isObject(x) && isFunction(x.then);
};
var isIterable = function isIterable(x) {
    return x && typeof x[Symbol.iterator] === "function";
};