I'm mostly thinking of functions with side-effects, much like {{ $var :=
"val" }}. It doesn't make much sense for these to return anything.
Not allowing 0-valued functions limits functions you can call on objects in
templates as well. For example, a trivial map implementation:
type MyMap map[string]interface{}
func (m MyMap) Set(key string, val interface{}) { m[key] = val }
And then in your function map:
"Map": func map() MyMap { return make(MyMap) }
You can't actually use Set in a template as it has void return.
On Fri, Apr 9, 2021 at 11:19 AM aind...@gmail.com <aindu...@gmail.com>
wrote:
> I believe functions are meant to be used as part of a pipeline, so having
> 1 value (+ error) makes it so the pipeline only stops execution on an
> error.
> I personally have not found a use for void functions, and it makes it
> easier
> to visualize the template execution model.
> On Friday, April 9, 2021 at 2:05:33 PM UTC-4 Johnny Jacobs wrote:
>
>> Hello all,
>>
>> Is there any reason you can't use a custom function with no return value
>> in Go templates?
>>
>> You get a "Can't call method/function with 0 results." if you try to call
>> such a function. FuncMap <https://golang.org/pkg/text/template/#FuncMap>
>> requires
>> functions to either return a value, or a value plus an error.
>>
>> Is there any reason, technical or otherwise, for these restrictions?
>> Variables assignment and many Action clauses don't give back values, so it
>> doesn't seem like it breaks convention.
>>
>> I might file an issue for this if nothing meaningful is brought up here.
>>
>> Best,
>> Johnny
>>
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