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Add set extend operation #663

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Jan 29, 2025
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Add set extend operation #663

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7 changes: 5 additions & 2 deletions infra.bs
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Original file line number Diff line number Diff line change
Expand Up @@ -1542,8 +1542,8 @@ list multiple assignment syntax is used.
<p>To <dfn export for=list>append</dfn> to a <a>list</a> that is not an <a>ordered set</a> is to
add the given <a for=list>item</a> to the end of the list.

<p>To <dfn export for=list>extend</dfn> a <a>list</a> |A| with a <a>list</a> |B|,
<a for=list>for each</a> |item| of |B|, <a for=list>append</a> |item| to |A|.
<p>To <dfn export for=list>extend</dfn> a <a>list</a> that is not an <a>ordered set</a> |A| with a
<a>list</a> |B|, <a for=list>for each</a> |item| of |B|, <a for=list>append</a> |item| to |A|.

<div class=example id=example-list-extend>
<ol>
Expand Down Expand Up @@ -1709,6 +1709,9 @@ ordered sets; implementations can optimize based on the fact that the order is n
the given <a for=set>item</a>, then do nothing; otherwise, perform the normal <a>list</a>
<a for=list>append</a> operation.

<p>To <dfn export for=set>extend</dfn> an [=ordered set=] |A| with a [=list=] |B|, [=list/for each=]
|item| of |B|, [=set/append=] |item| to |A|.

<p>To <dfn export for=set>prepend</dfn> to an <a>ordered set</a>: if the set
<a for=list>contains</a> the given <a for=set>item</a>, then do nothing; otherwise, perform the
normal <a>list</a> <a for=list>prepend</a> operation.
Expand Down