Hi all,

How can I change the following to a more D-like approach by using UFCS?

>double[3] result;
>Json json = res.readJson;
>for(int i = 0; i < json.length; i++){
>     result[i] = json[i].to!double;
>}

I'd prefer to do something like:

>result = res.readJson[].map!(to!double);

On Tuesday, 26 January 2021 at 00:47:09 UTC, Tim wrote:
> Hi all,
>
> How can I change the following to a more D-like approach by using UFCS?
>
>>double[3] result;
>>Json json = res.readJson;
>>for(int i = 0; i < json.length; i++){
>>     result[i] = json[i].to!double;
>>}
>
> I'd prefer to do something like:
>
>>result = res.readJson[].map!(to!double);

Use std.array.array (alias: std.range.array) to make the range returned my map!(to!double) into an array.
Note that the result of map isn't actually evaluated until it is iterated. std.array.array will iterate and collect. https://dlang.org/phobos/std_array.html#array

    result = res.readJson[].map!(to!double).array;

should work perfectly.

On Tuesday, 26 January 2021 at 00:47:09 UTC, Tim wrote:
> Hi all,
>
> How can I change the following to a more D-like approach by using UFCS?
>
>>double[3] result;

Unless you have a good reason, use a slice and not a static array:

    double[] result;

The result of std.array.array will be a slice anyway.

On Tuesday, 26 January 2021 at 01:38:45 UTC, Q. Schroll wrote:
> On Tuesday, 26 January 2021 at 00:47:09 UTC, Tim wrote:
>> Hi all,
>>
>> How can I change the following to a more D-like approach by using UFCS?
>>
>>>double[3] result;
>
> Unless you have a good reason, use a slice and not a static array:
>
>     double[] result;
>
> The result of std.array.array will be a slice anyway.

Why would I need to use a slice instead of a static array? I'm using a static array in this instance because I have and underlying 3d vector with double[3] as its base type

On Tuesday, 26 January 2021 at 02:19:10 UTC, Tim wrote:
> On Tuesday, 26 January 2021 at 01:38:45 UTC, Q. Schroll wrote:
>> On Tuesday, 26 January 2021 at 00:47:09 UTC, Tim wrote:
>>> Hi all,
>>>
>>> How can I change the following to a more D-like approach by using UFCS?
>>>
>>>>double[3] result;
>>
>> Unless you have a good reason, use a slice and not a static array:
>>
>>     double[] result;
>>
>> The result of std.array.array will be a slice anyway.
>
> Why would I need to use a slice instead of a static array? I'm using a static array in this instance because I have and underlying 3d vector with double[3] as its base type

In that case, maybe this untested code

double[3] result;

res.readJson[].map!(to!double).copy(result[]);