`set` tag not respecting scope in `for` loop about stencilswiftkit HOT 8 CLOSED

Yeah no, variables in Stencil are scoped within for tags (amongst others, we also have macro blocks in StencilSwiftKit). That means that whatever changes you make during a for loop, won't be accessible outside of that loop.

What you can always do is add an if test inside the for loop and check what the value of forloop.last is.

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@djbe thanks for the quick response!

{% forloop.last %} seems to be a Boolean valued indicator of the whether this is the last execution of the for loop. I think I need access to the last value of the for loop variable so I can have the current and last values at the same time. How would you generate the following?

// source file
enum ABC {
   case a,b,c
}
// generated file
func reduce(first: ABC, second: ABC) {
   switch (first, second) {
   case (.a, .b): print("ab")
   case (.b, .c): print("bc")
   default: print("unhandled")
   }
}

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@djbe I thought {% set lastCaseName %}{{ case.name }}{% endset %} would update the value of the lastCaseName within the scope of the enclosing for loop. But it does not. This seems a bug to me...

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No, each iteration of the for loop is a new scope.

I now understand what you're trying to achieve. I don't think there's an easy built-in way to achieve this, unfortunately. But, if you don't mind some bizarre code (untested):

{% for case1 in items %}
    {% if not forloop.first %}
        {% set firstLoopIndex %}forloop.counter{% endset %}
        {% for case2 in items %}
            {% if forloop.counter0 == firstLoopIndex %}
                // do stuff
                // {{ case1 }}, {{ case2 }}
            {% endif %}
        {% endfor %}
    {% endif %}
{% endfor %}

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{% set firstLoopIndex %}forloop.counter{% endset %} produces bad output.
Did you mean {% set firstLoopIndex %}{{ forloop.counter }}{% endset %} ?
Also, is forloop.counter0 a syntax error?

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Yeah I forgot the {{}} tags 😅. The counter0 is meant to be there, it’s a 0-based index instead of 1-based (see stencil docs)

_{Sent with GitHawk}

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@djbe thanks again for your response! Very much appreciated 👍
For anyone else encountering this scenario, beware: Sourcery versions < 11 do not support forloop.counter0. Luckily for me, Sourcery v11 was released 7 hours ago 😉

I would also suggest that special mention should be made in the docs that a for loop introduces a new scope with each iteration. This is highly irregular, and break the notion of what a scope is. This is surely a Stencil shortcoming, and needs to be explicitly called out.

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Hi @DanielAsher

I'd suggest you open an issue in the Stencil repo directly about that missing documentation about for loops creating new scopes on each iteration. You'd have better chances that the author of Stencil would see it and process it 😉

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