Observe:
each node contains a payload,
and a pointer to the next.
Order is not kept in one place.
It is distributed.
Implied.
Rewired.
A powerful device.
A dangerous device.
Perhaps we should educate by example.
[Verse 1]
I started with structs in a sensible array,
but the list said “professor, there’s a nimbler way.”
Take one little node and then send it away,
with a wink and a link and a next to obey.
A payload by morning, a pointer by day,
splice into the sequence, then quietly relay.
You need not move memory in cumbersome dray,
just alter relation and remake the display.
[Chorus]
Order from signal, and signal from light,
Meaning made local, then linked into sight.
Copy the pattern and keep it upright,
One little error and day becomes byte.
Information’s fragile, exacting, and bright,
Not in the pieces alone, but the rite.
Follow the pointer and do it just right,
Night after node after luminous night.
[Verse 2]
Now polymerase joins the game in its way,
and primers come hovering, eager to stay.
A sequence repeats and then doubles the play,
each phrase like a payload with something to say.
We drop half a line and accelerate away,
yet rhyme still reorders the bright cabaret.
The brooms start obeying, then cease to obey,
and ten thousand cousins come out to relay.
[Spoken Interjection]
Stop there.
Never overwrite your only reference
before securing the next.
Beware the dangling pointer.
Beware false comfort.
C is honest about the knife.
C++?
A joke in the name:
post-increment —
C, then one more.
And Java:
pointers hidden under clerical robes,
as though the dragon were gone
because you cannot see it.
Proceed.
Carefully.
[Final Chorus]
Order from signal, and signal from light,
Meaning made local, then linked into sight.
Copy the pattern and keep it upright,
One little error and day becomes byte.
Information is holy, abstruse, and bright,
Bound not by substance alone, but by rite.
Follow the pointer and do it just right,
Night after node after luminous night.
[Outro]
Class dismissed.
No — wait.
Who still has the head pointer?