Executable library: Difference between revisions
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→{{header|Wren}}: Minor tidy
m (→{{header|Sidef}}: update) |
m (→{{header|Wren}}: Minor tidy) |
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The strategy here is check whether the main module is the same as the library module and to treat is as executable if it is but as a library otherwise.
<syntaxhighlight lang="
var Hailstone = Fn.new { |n|
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// Check if it's being used as a library or not.
import "os" for Process
if (Process.allArguments[1] == "
libMain_.call()
}</syntaxhighlight>
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If we run this directly, we get the expected output:
<pre>
$ wren
For the Hailstone sequence starting with n = 27:
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If we now create a second module which imports the above and calls its Hailstone function:
<syntaxhighlight lang="
import "./
var freq = {}
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We can now run this to check that the executable code in hailstone.wren has been suppressed, giving us:
<pre>
$ wren
The Hailstone length returned most is 72, which occurs 1467 times.
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