Executable library: Difference between revisions

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.

 

 

var Hailstone = Fn.new { |n|

// Check if it's being used as a library or not.

import "os" for Process

libMain_.call()

}</syntaxhighlight>

If we run this directly, we get the expected output:

<pre>

 

For the Hailstone sequence starting with n = 27:

 

If we now create a second module which imports the above and calls its Hailstone function:

 

 

var freq = {}

We can now run this to check that the executable code in hailstone.wren has been suppressed, giving us:

<pre>

 

The Hailstone length returned most is 72, which occurs 1467 times.