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Show HN: Brain Frog – Can you be random enough for 11 lines of JavaScript?

47 points by AlexanderZ ago | 31 comments

hash0 |next [-]

I got 50 hits in 100 tries. That being said, I did not particularly like hitting that poor frog :'( Yes, I am the kind of player who would never choose the rude option when talking to an NPC.

|root |parent [-]

escanor |next |previous [-]

pure random player:

  (async function(punch, delay) {
    async function sleep(ms) {
      return new Promise((resolve, _) => {
        setTimeout(resolve, ms)
      })
    }
    
    for (let i = 0; i < 100; i++) {
      punch(['L', 'R'][(Math.random() * 2) | 0])
      await sleep(delay)
    }
  })(punch, 150)
  
"cheating" player:

  (async function(oracle, punch, delay) {
    async function sleep(ms) {
      return new Promise((resolve, _) => {
        setTimeout(resolve, ms)
      })
    }
    
    for (let i = 0; i < 100; i++) {
      punch((i + 1) < oracle.minForPrediction ? ['L', 'R'][(Math.random() * 2) | 0] : oracle.predictNextPunch() === 'L' ? 'R' : 'L')
      
      await sleep(delay)
    }
  })(oracle, punch, 150)

is it possible to do any better? i haven't fully read frog/oracle code

emrtnn |root |parent |next [-]

Less fancy hack here, intercept the prediction function on every punch and force the frog to take the opposite side. const realPunch = punch;

punch = function(myMove) {

  oracle.predictNextPunch = function() {
    return myMove === 'L' ? 'R' : 'L'; 
  };
  
  realPunch(myMove);
};

escanor |root |parent |previous [-]

it is:

  (async function(oracle, punch, delay) {
    async function sleep(ms) {
      return new Promise((resolve, _) => {
        setTimeout(resolve, ms)
      })
    }
    
    for (let i = 0; i < 100; i++) {
      const state = oracle._state
      const block = oracle.predictNextPunch()
      oracle._state = state
      
      punch(block === 'L' ? 'R' : 'L')
      
      await sleep(delay)
    }
  })(oracle, punch, 150)

mike_hock |next |previous [-]

You should make one where you can play against the branch predictors of various processors.

rllj |root |parent [-]

I was just about to comment the same! Sadly, branch predictors are incredibly well guarded secrets, mostly.

user- |next |previous [-]

I am briefly in the top ten after completely misunderstanding the rules nicee

thih9 |root |parent [-]

The ultimate unpredictability.

subarctic |next |previous [-]

Curious how a couple people got >100 hits on 100 punches

IdiotSavage |next |previous [-]

If you want to see what a random distribution looks like:

  jot -r 100 0 1 | rs -t 10
I noticed my "fake randomness" is lacking long sequences of the same key. I feel like I'm "predictable" when I press the same key 5 times in a row, yet that happens a lot in a truly random distribution.

brtkwr |next |previous [-]

Would be fairer if the frog occasionally got to throw a punch or two...

pjio |root |parent [-]

In the first round I struggled to notice if I missed. The frog punching back would be a good indicator. And I wouldn't feel so guilty for punching a pacifist frog.

sscaryterry |next |previous [-]

That was fun, got up to 79 :)

AlexanderZ |root |parent [-]

practice mode? the record for ranked matches is 64

sscaryterry |root |parent [-]

Yes

momoraul |next |previous [-]

46 and that was my ceiling. frogs smarter than me.

andai |next |previous [-]

Woah, neat. Is this like, a Markov chain?

AlexanderZ |root |parent [-]

a variation of Aaronson Oracle

digitalWestie |next |previous [-]

Just wanted to give the little guy a hug

jmpavlec |next |previous [-]

Looks like the leaderboard was hacked unfortunately. Fun little concept.

ramon156 |next |previous [-]

Leaderboard has been overtaken :(

|next |previous [-]

jv22222 |next |previous [-]

How many pixels wide is the hit zone?

AlexanderZ |root |parent [-]

you don't have to aim

vyrotek |next |previous [-]

Bam! 50 on the first try. Fun.

AlexanderZ |root |parent [-]

nice! try playing it the first thing every morning, it really wakes up your brain

ozyschmozy |next |previous [-]

Why does a silly little online game need my email to send a one-time login code? What a strange experience

AlexanderZ |root |parent [-]

because it doesn't? practice mode requires no login. if you want to play a ranked match then you'll need an account, how else could it work?

applfanboysbgon |root |parent |next [-]

> how else could it work?

Username+password. There is zero reason to require e-mail for account creation.

xorgun |root |parent [-]

[dead]

ozyschmozy |root |parent |previous [-]

Practice mode also has a popup telling you what to do which seems to negate the point of the game?

AlexanderZ |root |parent [-]

it's the coach mode telling you which biases you have so you can fix them in a ranked match

uberex |previous [-]

Free?!. Is there a "call us" SSO enabled plan?