Happy Asteroid Day! (June 30th)

• Today is Asteroid Day.

• Tomorrow is 7/1/17…a Palindrome! Also..a concatenation of two primes!

This will probably contain notes for my weekend as well.

Katas

• Swap values

def swap(a, b):
    temp = a
    a = b
    b = temp
    return a, b

Jacob calculate time

• Unless the traffic speed is less than his time, calc dist as his dist / time

function trafficJam(trafficSpeed, jacobSpeed, dist){
  if (trafficSpeed < jacobSpeed){
    return dist / trafficSpeed;
  }
  else{
    return dist / jacobSpeed;
  }
}

Solve quadratic equation

• It’s passing the kata in terms of the answer, but not the format :(

import math
def quadratic(a,b,c):
  

    try:  
      quad = ((b * (-1)) + (math.sqrt((math.pow(b, 2)) - (4 * a * c)))) / (2 * a)
      quad1 = ((b * (-1)) - (math.sqrt((math.pow(b, 2)) - (4 * a * c)))) / (2 * a)
      arr = []
      if quad1 == quad:
        arr.append(quad1)
        return quad1
      else:
        arr.append(quad1)
        arr.append(quad)
      return quad1, quad
    except:
      return "No real solution"
    return

Who will build the wall?

• Ah…another kata trashing the President. How original…easy points.

function whoIsPaying(name){
  var arr = [];
  if (name.length <= 2){
    arr.push(name)
    return arr;
  }
  else{
    var trunc = name.substring(0,2);
    arr.push(name)
    arr.push(trunc)
    return arr;
  }
}

Capitalize first letter in String

function capitalizeWord(word) {
  return word.charAt(0).toUpperCase() + word.slice(1);
}

Things to do

• Finish Udacity Week Two (Sunday/ Monday/ Tuesday ) (due on July 14th)

Interested in learning more about

• Herbrand’s Theorem

• Conal Elliott’s “Teaching New Tricks to Old Programs” from YOW! Conferences. This contains a bit of what he spoke about in the Haskell talk we saw in the Bay in ‘16.

• state monads

• Symbolic differentiation & automatic differentiation differences : apparently the one I learned in high school is symbolic differentiation. It’s always stuck in my mind, as I found it fascinating. I am only now learning about Automatic differentiation. Conal thinks the only differences between the two are really that the compiler’s interpretation is in Automatic, which is interesting.

• He says “derivative is a linear map. Derivatives are about affine approxmations.” Don’t think of them as a number. I’ve always thought of them as a rate of change (like stock fluctuations).

• He suggests (for reading) Michael Spivak’s “Calculus on Manifolds” which has the concept that the “derivative of every linear function is itself”.

And…

• I’m going on a sailing trip to see Fireworks for July 4th!! Yessss!! :) ‘Murica!