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Define exclusive ranges and list indices #386

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Jul 19, 2021
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Define exclusive ranges and list indices #386

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20 changes: 15 additions & 5 deletions infra.bs
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Expand Up @@ -1254,6 +1254,10 @@ all of its <a for=list>items</a>.
<p>A <a>list</a> <dfn export for=list,stack,queue,set lt="is empty|is not empty">is empty</dfn> if
its <a for=list>size</a> is zero.

<p>To <dfn export for=list,stack,queue,set lt="get the indices|indices">get the indices</dfn> of a
<a>list</a>, return <a lt="the exclusive range">the range</a> from 0 to the list's
<a for=list>size</a>, exclusive.

<p>To <dfn export for=list,set lt="iterate|for each">iterate</dfn> over a <a>list</a>, performing a
set of steps on each <a for=list>item</a> in order, use phrasing of the form
"<a for=list>For each</a> |item| of <var ignore>list</var>", and then operate on |item| in the
Expand Down Expand Up @@ -1376,9 +1380,15 @@ of creating a new <a>ordered set</a> |set| and, <a for=list>for each</a> |item|

<hr>

<p><dfn export lt="the range">The range</dfn> <var>n</var> to <var>m</var>, inclusive, creates a new
<a>ordered set</a> containing all of the integers from <var>n</var> up to and including <var>m</var>
in consecutively increasing order, as long as <var>m</var> is greater than or equal to <var>n</var>.
<p><dfn export lt="the range|the inclusive range">The range</dfn> <var>n</var> to <var>m</var>,
inclusive, creates a new <a>ordered set</a> containing all of the integers from <var>n</var> up to
and including <var>m</var> in consecutively increasing order, as long as <var>m</var> is greater
than or equal to <var>n</var>.

<p><dfn export lt="the exclusive range">The range</dfn> <var>n</var> to <var>m</var>, exclusive,
creates a new <a>ordered set</a> containing all of the integers from <var>n</var> up to and including
<var>m</var> &minus; 1 in consecutively increasing order, as long as <var>m</var> is greater than
<var>n</var>. If <var>m</var> equals <var>n</var>, then it creates an empty <a>ordered set</a>.

<p class=example id=example-the-range><a for=set>For each</a> <var>n</var> of <a>the range</a> 1 to
4, inclusive, &hellip;
Expand Down Expand Up @@ -1440,11 +1450,11 @@ from the map.
We can also denote this by saying that, for an <a>ordered map</a> |map| and key |key|, "|map|[|key|]
<a for=map>exists</a>".

<p>To <dfn export for=map lt="getting the keys|get the keys">get the keys</dfn> of an
<p>To <dfn export for=map lt="getting the keys|get the keys|keys">get the keys</dfn> of an
<a>ordered map</a>, return a new <a>ordered set</a> whose <a for=set>items</a> are each of the
<a for=map>keys</a> in the map's <a for=map>entries</a>.

<p>To <dfn export for=map lt="getting the values|get the values">get the values</dfn> of an
<p>To <dfn export for=map lt="getting the values|get the values|values">get the values</dfn> of an
<a>ordered map</a>, return a new <a>list</a> whose <a for=list>items</a> are each of the
<a for=map>values</a> in the map's <a for=map>entries</a>.

Expand Down