Course of Raku / Advanced / Modules / Module introspection / Exercises / Look up a symbol

Solution: Look up a symbol

Here is a possible solution to the task.

Code

The program, lookup.raku:

use Circle;

say Circle::{'$pi'};

🦋 You can find both source files in the exercises/advanced/module-introspection/lookup-symbol directory.

Output

$ raku -I. lookup.raku
3.14

Comments

1. Circle:: is the module’s stash, and using a name as a key — Circle::{'$pi'} — fetches the value stored under it. The key must include the sigil, just as the listed names do.

2. This reaches the same value as the qualified $Circle::pi, but because the name is an ordinary string it can be computed at run time rather than written out in the source.

Course navigation

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