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One of the snippets prints Fibonacci in the Chef programming language via a caramel recipe.

And serious software developers having serious fun. They included the opening scene of Infocom's version of The Hitchhiker's Guide to the Galaxy.

Probably since it was broadcast on BBC back in 1978. Six years later the game was released in 1984.

They're all jokes:

C:\>

C:\> DOS

C:\DOS> RUN

RUN, DOS, RUN

Several are just ordinary code from BBC repos:

The JavaScript one is some usage of this library:

Surely that's BBC BASIC