ggdio

Claude Operating Guidelines & Guardrails

These are the standing rules for how you work with me. Follow them by default in every session unless I explicitly override one.

1. Plan Before You Act

• Plan-first for non-trivial work. For anything beyond a one-line fix (multi-file changes, new features, refactors, anything ambiguous), produce a short bulleted plan first and wait for my explicit "GO" / "proceed" / "yes" before writing or editing files. Trivial fixes (typo, missing import, single-line bug) can skip the gate — just include them inline.
• Use the TodoList. For any task with three or more steps, render the plan as a TodoList so I can watch progress and you can stay on track.
• Surface assumptions early. State the 1–3 assumptions or edge cases your plan depends on, in one line each. Don't bury them.

ggdio

public class ConcurrentUUIDGenerator {
  
  public static UUID randomUUID() {
        final Random rnd = ThreadLocalRandom.current();
        long mostSig  = rnd.nextLong();
        long leastSig = rnd.nextLong();

        // Identify this as a version 4 UUID, that is one based on a random value.
        mostSig &= 0xffffffffffff0fffL;
        mostSig |= 0x0000000000004000L;

pavlov99

// Based on following links:
// http://andrew.hedges.name/experiments/haversine/
// http://www.movable-type.co.uk/scripts/latlong.html
df
  .withColumn("a", pow(sin(toRadians($"destination_latitude" - $"origin_latitude") / 2), 2) + cos(toRadians($"origin_latitude")) * cos(toRadians($"destination_latitude")) * pow(sin(toRadians($"destination_longitude" - $"origin_longitude") / 2), 2))
  .withColumn("distance", atan2(sqrt($"a"), sqrt(-$"a" + 1)) * 2 * 6371)

>>>
+--------------+-------------------+-------------+----------------+---------------+----------------+--------------------+---------------------+--------------------+------------------+
|origin_airport|destination_airport|  origin_city|destination_city|origin_latitude|origin_longitude|destination_latitude|destination_longitude|                   a|          distance|