Array.prototype.find

Andrea Giammarchi andrea.giammarchi at gmail.com
Thu Jun 6 15:56:51 PDT 2013


the fact reduce/Right a part all methods accept a thisValue ... I am happy
with current method though, still not sure if thisValue will be commonly
needed or not.


On Thu, Jun 6, 2013 at 3:44 PM, Rick Waldron <waldron.rick at gmail.com> wrote:

>
>
>
> On Thu, Jun 6, 2013 at 4:43 PM, Andrea Giammarchi <
> andrea.giammarchi at gmail.com> wrote:
>
>> I guess just consistency with other Array#forEach/map/every,etc,etc
>> methods plus you don't need to create N bound functions or N arrow
>> functions per each Array#find call ... or not?
>>
>
>
> None of those have a "default return value", so what are you referring to?
>
> Rick
>
>
>>
>>
>> On Thu, Jun 6, 2013 at 1:20 PM, Jussi Kalliokoski <
>> jussi.kalliokoski at gmail.com> wrote:
>>
>>> What would be the use case for this that isn't covered with
>>> Function#bind() or arrow functions?
>>>
>>> Cheers,
>>> Jussi
>>>
>>>
>>>  On Wed, May 29, 2013 at 5:50 AM, Axel Rauschmayer <axel at rauschma.de>wrote:
>>>
>>>>  It might make sense to add a third argument to that method, so that
>>>> it works roughly like this:
>>>>
>>>>     Array.prototype.find = function (predicate, returnValue =
>>>> undefined, thisArg = undefined) {
>>>>         var arr = Object(this);
>>>>         if (typeof predicate !== 'function') {
>>>>             throw new TypeError();
>>>>         }
>>>>         for(var i=0; i < arr.length; i++) {
>>>>             if (i in arr) {  // skip holes
>>>>                 var elem = arr[i];
>>>>                 if (predicate.call(thisValue, elem, i, arr)) {
>>>>                     return elem;
>>>>                 }
>>>>             }
>>>>         }
>>>>         return returnValue;
>>>>     }
>>>>
>>>>         --
>>>> Dr. Axel Rauschmayer
>>>> axel at rauschma.de
>>>>
>>>> home: rauschma.de
>>>> twitter: twitter.com/rauschma
>>>> blog: 2ality.com
>>>>
>>>>
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