Challenge 1: Build a View Counter — Possible Solution
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127.0.0.1:6379> SET page:about 0
OK
127.0.0.1:6379> INCR page:about
(integer) 1
127.0.0.1:6379> INCR page:about
(integer) 2
127.0.0.1:6379> INCR page:about
(integer) 3

WHY THIS WORKS AS AN ANSWER
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SET page:about 0 initializes the counter at a known starting value —
without this, the first INCR would still work (Redis treats a missing
key as 0 for INCR), but explicitly initializing it makes the starting
state clear rather than relying on that implicit default.

Each subsequent INCR page:about atomically adds 1 to the current value
and returns the NEW value directly — 1, then 2, then 3 — confirming the
counter incremented correctly after each call, exactly the atomic,
race-condition-free counter behavior this chapter described as INCR's
key benefit over a naive read-then-write approach.