dbramucci

(* 
   If you want, you can replace all 
   +?
   with
   +
   and this will still work.
   It's just that the default (+) for `int` will be shadowed after the
   let Open Num in
   line
*)

dbramucci

def fib(n):
    a, b = 0, 1
    for _ in range(n):
        a, b = b, a + b
    return a

# fib n = go 0 1 n
#   where go a _ 0 = a
#         go a b n = go b (a + b) (n - 1)

dbramucci

hailstone :: [[Int]]
hailstone = [] : [1] : map (\n -> let n' = collatz n in n : (hailstone !! n')) [2..]
  
collatz n = if even then half else 3 * n + 1
    where
      (half, r) = n `quotRem` 2
      even = r == 0

{- GHCI output, _ means that part hasn't been evaluated yet
Prelude> hailstone !! 3

dbramucci

# Forgets results in between calls
# Also, it is nowhere close to as efficient as the Haskell version
# i.e. I think this is exponential in time
def fibs_gen():
    yield 0
    yield 1
    
    fib = fibs_gen()
    
    fib_tail = fibs_gen()

dbramucci

from typing import List

from pyrsistent import pvector
from pyrsistent.typing import PVector

def benchmark_jump(n: int):
    string = 'xx.' * n
    for i in range(0, n, 3):
        string = jump(string, i, 1)

dbramucci

def Zero(zero_val):
    return lambda rec_func: zero_val


def Succ(nat):
    return lambda zero_val: lambda rec_func: rec_func(nat)


def add(a):
    return (lambda b:

dbramucci

using System;
using System.Threading;

// S is the type stored for successful computations, E for errors
public struct Result<S, E>
{
  private bool isSuccessful;
  private S successValue;
  private E errorValue;

dbramucci

from timeit import timeit

a = list(range(6))
num = 1_000_000

print("toons's: ", timeit("""    
i = iter(islice(iter(a), 0, len(a), 2))      
j = iter(islice(iter(a), 1, len(a), 2))      
try:      

dbramucci

-- save as HaskellCheatsheet.hs
module HaskellCheatsheet where
-- On Windows, I sometimes have to remove the module line above
-- in order to get GHC to compile the file as an executable instead
-- of a library.


-- Single line comment

{- 

dbramucci

• Protocol
• One JSON Dictionary transmitted as a string through ws or wss
• All Packets
  • Fields
    • "PacketType" - string
      • Describes what type of packet this is
    • "PacketID" - string
      • Uniquely identifies the string transmitted
    • "ProtocolVersion" - string
• Identifies the current version of the protocol being used