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from microbit import *

while True:
	moisture = pin0.read_analog()
	if button_a.is_pressed():
		if moisture <= 1023 and moisture > 0:
			display.scroll(moisture)
		else:
        	display.show(Image.SAD)
	sleep(5000)

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# Add your Python code here. E.g.
from microbit import *
import random

playing = False
winner = "-"
min_time = 300
max_time = 700

while True:

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# Add your Python code here. E.g.
from microbit import *
import radio

nodes = ["00","01","02","10","11","12","20","21","22"]
board = [
    ["","",""],
    ["","",""],
    ["","",""]
    ]

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Studying for a Tech Interview Sucks, so Here's a Cheat Sheet to Help

This list is meant to be a both a quick guide and reference for further research into these topics. It's basically a summary of that comp sci course you never took or forgot about, so there's no way it can cover everything in depth. It also will be available as a gist on Github for everyone to edit and add to.

Data Structure Basics

Array

Definition:

• Stores data elements based on an sequential, most commonly 0 based, index.

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def multiples_up_to(multiple, limit)
  # Rather than calculate every number and evaluate whether that number is a multiple, there's a handy bit of math I found that checks how many multiples are in any number of integers.
  # We then keep adding up the "multiple", doing basic arithmetic until we reach the limit
  start = 0
  ((limit - multiple + 1)/multiple).times do
    start += multiple
    p start
  end
end

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class String
  # Opens up string class, to allow these methonds to be called directly on the string rather than passed as a variable to a method.
  def rev_string
    # Splits the string into an array, for iterative purposes
    str_arr = self.chars
    # Builds a temporary array
    tmp_arr = []
    str_arr.length.times do
      # grabs the end of the str_array, and makes it the first of our new array
      tmp_arr << str_arr.pop

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require "test/unit"

class ListTester < Test::Unit::TestCase
  def test_node_integrity
    node = Node.new(1)
    assert_equal(1,node.value)
    assert_equal(nil,node.next_node)
    assert_equal(nil,node.previous_node)
  end

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Rails ActiveRecord (association) - Cheatsheet

http://guides.rubyonrails.org/association_basics.html

Types of associations

• belongs_to : TABLE_NAME
• has_one : TABLE_NAME [:through => :TABLE_NAME]
• has_many : TABLE_NAME [:through => :TABLE_NAME]
• has_and_belongs_to_many : TABLE_NAME [:join_table => :TABLE_NAME]