Modulinos: Difference between revisions

=={{header|Wren}}==

As far as Wren is concerned, a modulino and an executable library seem to be different names for the same thing. This therefore uses the same technique as the [[Executable_library#Wren]] task to create a simple modulino.

Note that Wren doesn't need or normally use a ''main()'' function to start a script, though we use one here to make the example clearer.

First we create a module for our modulino:

<lang ecmascript>/* modulino.wren */

var MeaningOfLife = Fn.new { 42 }

var main = Fn.new {

System.print("The meaning of life is %(MeaningOfLife.call()).")

}

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

import "os" for Process

if (Process.allArguments[1] == "modulino.wren") { // if true, not a library

main.call()

}</lang>

and run it to make sure it works OK when run directly:

{{output}}

<pre>

The meaning of life is 42.

</pre>

Next we create another module which imports the modulino:

<lang ecmascript>/* modulino_main.wren */

import "/modulino" for MeaningOfLife

var main = Fn.new {

System.print("Who says the meaning of life is %(MeaningOfLife.call())?")

}

main.call()</lang>

and run this to make sure the modulino's ''main()'' function doesn't run:

{{output}}

<pre>

Who says the meaning of life is 42?

</pre>