Named parameters: Difference between revisions

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<span style="color: #008080;">with</span> <span style="color: #008080;">javascript_semantics</span>
<span style="color: #008080;">with</span> <span style="color: #008080;">javascript_semantics</span>
<span style="color: #008080;">include</span> <span style="color: #000000;">timedate</span><span style="color: #0000FF;">.</span><span style="color: #000000;">e</span>
<span style="color: #008080;">include</span> <span style="color: #004080;">timedate</span><span style="color: #0000FF;">.</span><span style="color: #000000;">e</span>
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<span style="color: #008080;">constant</span> <span style="color: #000000;">fourdays</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">timedelta</span><span style="color: #0000FF;">(</span><span style="color: #000000;">days</span><span style="color: #0000FF;">:=</span><span style="color: #000000;">4</span><span style="color: #0000FF;">)</span>

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<span style="color: #008080;">constant</span> <span style="color: #000000;">fourdays</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">timedelta</span><span style="color: #0000FF;">(</span><span style="color: #000000;">days</span><span style="color: #0000FF;">:=</span><span style="color: #000000;">4</span><span style="color: #0000FF;">)</span>
<span style="color: #000080;font-style:italic;">-- fourdays = timedelta(0,4) -- equivalent</span>
<span style="color: #000080;font-style:italic;">-- fourdays = timedelta(0,4) -- equivalent</span>

<span style="color: #7060A8;">printf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"fourdays = %s\n"</span><span style="color: #0000FF;">,{</span><span style="color: #7060A8;">elapsed</span><span style="color: #0000FF;">(</span><span style="color: #000000;">fourdays</span><span style="color: #0000FF;">)})</span>
<span style="color: #7060A8;">printf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"fourdays = %s\n"</span><span style="color: #0000FF;">,{</span><span style="color: #7060A8;">elapsed</span><span style="color: #0000FF;">(</span><span style="color: #000000;">fourdays</span><span style="color: #0000FF;">)})</span>

<span style="color: #000080;font-style:italic;">-- **NB** a plain '=' is a very different thing:</span>
<span style="color: #000080;font-style:italic;">-- **NB** a plain '=' is a very different thing:</span>
<span style="color: #004080;">integer</span> <span style="color: #000000;">days</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span>
<span style="color: #004080;">integer</span> <span style="color: #000000;">days</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span>
<span style="color: #008080;">constant</span> <span style="color: #000000;">wrong</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">timedelta</span><span style="color: #0000FF;">(</span><span style="color: #000000;">days</span><span style="color: #0000FF;">=</span><span style="color: #000000;">4</span><span style="color: #0000FF;">)</span> <span style="color: #000080;font-style:italic;">-- equivalent to timedelta([weeks:=]iff((equal(days,4)?true:false))
<span style="color: #008080;">constant</span> <span style="color: #000000;">oneday</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">timedelta</span><span style="color: #0000FF;">(</span><span style="color: #000000;">days</span><span style="color: #0000FF;">=</span><span style="color: #000000;">4</span><span style="color: #0000FF;">)</span> <span style="color: #000080;font-style:italic;">-- equivalent to timedelta([weeks:=]iff((equal(days,4)?true:false))
-- - with an error if no local variable days exists.</span>
-- - with an error if no local variable days exists.</span>

<span style="color: #7060A8;">printf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"wrong = %s\n"</span><span style="color: #0000FF;">,{</span><span style="color: #7060A8;">elapsed</span><span style="color: #0000FF;">(</span><span style="color: #000000;">oneday</span><span style="color: #0000FF;">)})</span>
<span style="color: #7060A8;">printf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"wrong = %s\n"</span><span style="color: #0000FF;">,{</span><span style="color: #7060A8;">elapsed</span><span style="color: #0000FF;">(</span><span style="color: #000000;">oneday</span><span style="color: #0000FF;">)})</span>

<span style="color: #004080;">integer</span> <span style="color: #000000;">hours</span><span style="color: #0000FF;">=</span><span style="color: #000000;">7</span>
<span style="color: #004080;">integer</span> <span style="color: #000000;">hours</span><span style="color: #0000FF;">=</span><span style="color: #000000;">7</span>
<span style="color: #008080;">constant</span> <span style="color: #000000;">shift</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">timedelta</span><span style="color: #0000FF;">(</span><span style="color: #000000;">hours</span><span style="color: #0000FF;">:=</span><span style="color: #000000;">hours</span><span style="color: #0000FF;">)</span> <span style="color: #000080;font-style:italic;">-- perfectly valid (param hours:=local hours)
<span style="color: #008080;">constant</span> <span style="color: #000000;">shift</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">timedelta</span><span style="color: #0000FF;">(</span><span style="color: #000000;">hours</span><span style="color: #0000FF;">:=</span><span style="color: #000000;">hours</span><span style="color: #0000FF;">)</span> <span style="color: #000080;font-style:italic;">-- perfectly valid (param hours:=local hours)
-- timedelta(0,hours:=15,3) -- illegal (it is not clear whether you meant days:=3 or minutes:=3)</span>
-- timedelta(0,hours:=15,3) -- illegal (it is not clear whether you meant days:=3 or minutes:=3)</span>

<span style="color: #7060A8;">printf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"shift = %s\n"</span><span style="color: #0000FF;">,{</span><span style="color: #7060A8;">elapsed</span><span style="color: #0000FF;">(</span><span style="color: #000000;">shift</span><span style="color: #0000FF;">)})</span>
<span style="color: #7060A8;">printf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"shift = %s\n"</span><span style="color: #0000FF;">,{</span><span style="color: #7060A8;">elapsed</span><span style="color: #0000FF;">(</span><span style="color: #000000;">shift</span><span style="color: #0000FF;">)})</span>
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Note that pwa/p2js automatically maps named parameters to positional parameters for you, since JavaScript does not support named parameters.
Note that pwa/p2js automatically maps named parameters to positional parameters for you, since JavaScript does not support named parameters.
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