jQuery $.wait() for *all* deferred's to be rejected?

Question

jQuery has a nice feature of its Deferred API, $.wait() for working with multiple Deferreds / Promises. It returns when:<

Answer 1

i had the same problem lately: I think that occurs because $.when is more of a Promise.all implementation.

I wasn't able to find a Promise.allSettled alternative in the jQuery documentation and across the web so here's my attempt to get it:

const deferredsAllSettled = deferreds => {
    const settlements = [];

    deferreds.forEach(deferred => {
        const settlement = jQuery.Deferred();

        deferred.always(settlement.resolve);

        settlements.push(settlement);
    });

    const returnedDeferred = $.Deferred();

    jQuery.when
        .apply(jQuery, settlements)
        .then(() =>
            returnedDeferred.resolve(
                deferreds.map(deferred => deferred.promise())
            )
        );

    return returnedDeferred.promise();
};

NOTE: I've written that for a utils file so the Promise.allSettled one-only iterable parameter signature was ok for me, if you want to write it in the $.when spirit (passing and getting the $.Deferreds as separate arguments) you'll have to write a little more...