Tested programs

Every complete Raku program in these books is compiled and run at build time under two compilers — Rakudo (the reference implementation) and Raku++ (the engine that runs code in your browser via Raku.js). A program gets a Run button only when it runs under Rakudo and Raku++ reproduces the same output. Of 1341 Raku programs across the books: 349 run in the browser, 908 are illustrative fragments (no Run button), 29 need a local environment (files or the command line), 28 use concurrency the single-threaded in-browser engine can’t run, and 27 are valid programs the in-browser engine cannot run correctly yet.

Programs that need a local environment

These are complete, valid Raku programs, but they read the filesystem, spawn processes, or use the command line — things the sandboxed in-browser engine has no access to. They run fine on your own computer.

Program	Book	Why
Renaming files	Raku One-Liners	reads the local environment
Merging files horizontally	Raku One-Liners	reads the local environment
Reversing a file	Raku One-Liners	reads the local environment
All the stars of Raku	Raku One-Liners	reads the local environment
18. Finding duplicate texts	Using Raku	reads the local environment
92. Sleep Sort	Using Raku	reads the local environment
94. Parallel file processing	Using Raku	reads the local environment
95. The cat utility	Using Raku	reads the local environment
97. Reading directory content	Using Raku	reads the local environment
Creating a Simple Translator	Creating a Compiler in Raku	reads the local environment
Grammar	Creating a Compiler in Raku	reads the local environment
Test runner	Creating a Compiler in Raku	reads the local environment
Twigils	Perl 6 at a Glance	reads the local environment
Frequently used special variables	Perl 6 at a Glance	reads the local environment
An example	Perl 6 at a Glance	reads the local environment
Files	Perl 6 at a Glance	reads the local environment

Programs that use concurrency

These use promises or threads. The in-browser engine (Raku.js) is single-threaded, so real parallelism deadlocks — run these on your own computer.

Program	Book	Why
14. The longest common substring	Using Raku	uses concurrency (promises/threads)
17. The longest palindrome	Using Raku	uses concurrency (promises/threads)
91. Setting timeouts	Using Raku	uses concurrency (promises/threads)
April	Perl 6 Calendar 2019	uses concurrency (promises/threads)
Read and write	Perl 6 at a Glance	uses concurrency (promises/threads)
The list method	Perl 6 at a Glance	uses concurrency (promises/threads)
Beyond scalars	Perl 6 at a Glance	uses concurrency (promises/threads)
The closed method	Perl 6 at a Glance	uses concurrency (promises/threads)
Basics	Perl 6 at a Glance	uses concurrency (promises/threads)
start	Perl 6 at a Glance	uses concurrency (promises/threads)
in and at	Perl 6 at a Glance	uses concurrency (promises/threads)
anyof and allof	Perl 6 at a Glance	uses concurrency (promises/threads)

Programs the in-browser engine can’t run yet

These are complete, valid Raku programs, but Raku++ errors or prints something different from Rakudo — a gap to close in the browser engine. Each page still shows the program’s expected output.

Program	Book	Why
All the stars of Raku	Raku One-Liners	Raku++ output differs
The second test	Raku One-Liners	Raku++ output differs
10. DNA-to-RNA transcription	Using Raku	Raku++ output differs
32. Generating random numbers	Using Raku	Raku++ output differs
36. Standard deviation	Using Raku	Raku++ output differs
38. Monte Carlo method	Using Raku	Raku++ error (non-deterministic)
78. Separate digits and letters	Using Raku	Raku++ output differs
81. Pig Latin	Using Raku	Raku++ output differs
82. Simple string compressor	Using Raku	Raku++ output differs
84. Decode Roman numerals	Using Raku	Raku++ output differs
86. Basic calculator	Using Raku	Raku++ output differs
!, not	Perl 6 at a Glance	Raku++ output differs
Method postfixes	Perl 6 at a Glance	Raku++ output differs
before, after	Perl 6 at a Glance	Raku++ output differs
Modules	Perl 6 at a Glance	Raku++ output differs
Private (closed) methods	Perl 6 at a Glance	Raku++ output differs
Unicode	Perl 6 at a Glance	Raku++ output differs

Verified-runnable programs

Raku One-Liners — 23 programs

Using Raku — 59 programs

Creating a Compiler in Raku — 6 programs

Perl 6 Calendar 2019 — 11 programs

Perl 6 at a Glance — 51 programs