had instantly same thought ... I use functions in Array very often to handle/manage asynchronous queues
br On Sun, Mar 3, 2013 at 6:49 PM, Rick Waldron <[email protected]> wrote: > > > > On Sun, Mar 3, 2013 at 9:38 PM, Brandon Benvie <[email protected]>wrote: > >> I was going to say... >> >> indexOf with a callback is the best thing since sliced bread. >> > > Is this +1 to findIndex? > > I ask because: > > var a = function() {}, array = [a]; > > array.indexOf(a); // 0 > > > Rick > > > >> >> On Mar 3, 2013, at 5:26 PM, Rick Waldron <[email protected]> wrote: >> >> >> >> >> On Sun, Mar 3, 2013 at 5:33 PM, Brendan Eich <[email protected]> wrote: >> >>> Bjoern Hoehrmann wrote: >>> >>>> * David Bruant wrote: >>>> >>>>> I've found myself multiple times in a situation where I needed the >>>>> index >>>>> of the first element responding to some conditions. I solved it the >>>>> following way: >>>>> >>>>> var index; >>>>> array.some(function(e, i){ >>>>> if(someCondition(e)){ >>>>> index = i; >>>>> return false; >>>>> } >>>>> >>>>> return true; >>>>> }) >>>>> >>>> >>>> It's usually a bad idea to trigger side-effects from such callbacks. The >>>> proper solution here would be having a suitable method available, like >>>> >>>> var index = array.findIndex(someCondition)**; >>>> >>>> as it is called in Haskell and C#. >>>> >>> >>> Hi Bjoern, findIndex is indeed a missing Array generic. I'll see if we >>> can get it on the agenda for the next TC39 meeting (coming up quickly, >>> mid-March). Thanks, >>> >> >> Despite my previous message with a solution that relied on >> array.reduce(...), the benefit of stopping the iteration (once the >> predicate returns true) is objectively compelling. >> >> Rick >> >> >>> >>> /be >>> >>> _______________________________________________ >> es-discuss mailing list >> [email protected] >> https://mail.mozilla.org/listinfo/es-discuss >> >> > > _______________________________________________ > es-discuss mailing list > [email protected] > https://mail.mozilla.org/listinfo/es-discuss > >
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