Can't do push in forEach

Emanuel Allen emanuelallen at hotmail.com
Thu May 14 18:36:19 UTC 2015


It should allow for:

arr.forEach(arr.push.only(1));//only return a function limiting the number of arguments pass to it...

But I guess this work too:
arr.forEach(e=>arr.push(e));

But my goal was to just:
arr.forEach(arr.push);//will not work

So this style I favorite since I want to avoid creating another function:
arr.forEach(arr.push.only(1));

Even know only will return another function base on the parameter to you pass to it.

Still, I think it would be a great addition to the Function.prototype object.

JS4L

> On May 14, 2015, at 1:42 PM, Andrea Giammarchi <andrea.giammarchi at gmail.com> wrote:
> 
> `$1 => a.push($1)`
> 
> fat arrow function shines mostly in these cases, not sure there's a need for anything else.
> 
> `($1, $2, $3) => a.push($2, $3)`
> 
> Regards
> 
>> On Thu, May 14, 2015 at 5:26 PM, Emanuel Allen <emanuelallen at hotmail.com> wrote:
>> That would be great to have an only method on Function.prototype.only
>> 
>> It can take one to three parameters as arguments:
>> -Only with using the first argument:
>> 
>> SomeFunction.only(1);
>> only allow the first argument in. It target the place holder so: fn.only(2) allow the two most left argument in.
>> 
>> -Only with using the first 2 argument:
>> 
>> SomeFunction.only(1,2);
>> only allow the second argument in; the second argument target where to start and the first not how many to let in. So fn.only(2,3); let the third and fourth argument in. 
>> 
>> -Only with using all arguments placeholder:
>> 
>> SomeFunction.only(1,2,true);
>> This will denote that we start from the right and and let the second from last argument in 
>> 
>> The last parameter is informing if we should start left or right when choosing the parameters to let in. The default is false; start left to right 
>> 
>> Internally this could use the function's arguments object to query what to let in.
>> 
>> JS4L
>> 
>>> On May 14, 2015, at 11:37 AM, Allen Wirfs-Brock <allen at wirfs-brock.com> wrote:
>>> 
>>> 
>>>> On May 14, 2015, at 8:19 AM, Emanuel Allen wrote:
>>>> 
>>>> Oh yes that is correct since push will push in elements separated by commas... Still my original problem is that I can't simply do arr.push(arr2.push); but it doesn't matter since it'll also push the three parameters into the array as well. 
>>> 
>>> exactly, see http://www.wirfs-brock.com/allen/posts/166 
>>> 
>>>> 
>>>> 
>>>> Sent from my iPhone
>>>> 
>>>>> On May 14, 2015, at 10:49 AM, Erik Arvidsson <erik.arvidsson at gmail.com> wrote:
>>>>> 
>>>>> Still, the callback for forEach is called with 3 arguments; value, index and the array.
>>>>> 
>>>>> This is clearly documented in the spec and mdn and other resources.
>>>>> 
>>>>> 
>>>>>> On Thu, May 14, 2015, 10:42 Garrett Smith <dhtmlkitchen at gmail.com> wrote:
>>>>>> On 5/14/15, Emanuel Allen <emanuelallen at hotmail.com> wrote:
>>>>>> > Surprise that I can't do arr1.forEeach(arr2.push);
>>>>>> >
>>>>>> 
>>>>>> Check that line more carefully.
>>>>>> 
>>>>>> 
>>>>>> > Will throw an error.
>>>>>> >
>>>>>> > Using bind as:
>>>>>> >
>>>>>> > push = arr2.bind(push);
>>>>>> 
>>>>>> Arrays don't have a bind method.
>>>>>> --
>>>>>> Garrett
>>>>>> @xkit
>>>>>> ChordCycles.com
>>>>>> garretts.github.io
>>>>>> personx.tumblr.com
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