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1. C - Dm => C - C#dim7(A7) - Dm; F - G => F - F#dim - G
2. minor, half note down... michelle the beatles
3. 4736251 + leading bass 1765.., secondary domiant
4. passing chord
5. V7 half note down... C - Bb7 - A7 - Ab7 - G7 - any major
   reason: multiple dominant fuzz the tonality
6. mode - color
   minor dorian
   major lydian
   dominant phrygian-dominant

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const arr = Array(5).fill([true]))
arr[0][0] = false
console.log(arr) //guess what!

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function _go(g, step) {
  while(!step.done) {
    //run the closure function
    const [state, value] = step.value()

    switch (state) {
      case "park":
        // just wait, add to eventloop
        // setImmediate(function() { _go(g, step) })
        setTimeout(function() { _go(g, step) })

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import numpy as np

# linspace：创建线段

arr = np.array([[1, 2, 3]
                [4, 5, 6]], dtype=int32) # list to matrix

arr.ndim # 2 dimensions
arr.shape # 2 * 3
arr.size # number of elements

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# http://sahandsaba.com/interview-question-groupon-probability.html
import random

def bernoulli_process(p):
    if p > 1.0 or p < 0.0:
        raise ValueError("p should be between 0.0 and 1.0.")
    while True:
        yield random.random() > p

def von_neumann_extractor(process):

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import signal

# broken in eventloop things
class Promise:
    def __init__(self, f):
        self.status = 'PENDING'
        self.cb = None
        f(self.__resolve)

    def resolve(v):

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# naming conventions: 
# module_name, package_name, method_name, function_name, global_var_name, instance_var_name, function_parameter_name, local_var_name
# ClassName, ExceptionName
# GLOBAL_CONSTANT_NAME

*a = *range(3),  #(1, 2, 3)

#################
# http://sahandsaba.com/thirty-python-language-features-and-tricks-you-may-not-know.html

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I ii  iii  IV V   vi  vii'
i ii' IIIb iv v   VIb VIIb
  II7 III7    Vb7 VI7
  IIb

?: iib iiib vb vib viib vii VII

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-- lambda 
data Term = Lam Var Term
          | Var Var
          | App Term Term -- func application

data Var = V String

instance Show Var where
    show (V s) = s
    

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HASKELL PROGRAMMING FROM FIRST PRINCIPLES

CHAPTER1. ALL YOU NEED IS LAMBDA

1.1 All You Need is Lambda

lambda calculus:

computation model, 1930s, Alonzo Church, formalizing a method, Turing machines