Add "extend" to help putting multiple items from one list into another

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
62/100
Issue type
Feature
Clarity
Mostly clear
Activity status
Quiet
Tech stack
javascript
Domain
web-dev

Research direction

The issue names no files or tests; start by tracing the existing list assignment, append, and “split by” handling in the hyperscript implementation. Done means the proposed extend $assignees with ... syntax accepts multiple items from another list, including the shown data-attribute case, while the empty-value behavior is understood or separately scoped.

Written by the indexing model from the issue text.

Description

In Python we have "list.extend(otherlist)" as a multi-item "append" basic function.

I found that this is a bit tedious in hyperscript (or of course I might be missing something). Especially if I'm parsing something where the result could be a non-list (which is also interesting in its own from a typing perspective that splitting an empty string results in a non-list):

<span data-assignees="a b c"
  _="init
          set $assignees to my @data-assignees split by ' '
          if not $assignees then set $assignees to []" />

I wish I could do this instead:

<span data-assignees="a b c"
  _="init
          set $assignees to []
          extend $assignees with my @data-assignees split by ' '
        " />

We could also consider whether "split by" should always return a list (I'm not quite sure what's going on there when @data-assignees is an empty value) but that's orthogonal to the extend ability.

Dominant language
JavaScript
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Forks
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