MilanGrubnic70

###One to One

###One to Many

###Many to Many

MilanGrubnic70

#SQLite3

CREATE TABLE tablename (id PRIMARY KEY AUTOINCREMENT, name string, age integer)

INSERT INTO tablename VALUES(Milan, 43)

MilanGrubnic70

md = "cheese".match([^aeiou]*)(.*)  
md == <MatchDate "cheese" 1: "ch" 2: "eese">
md[1] => "ch"  
md[2] => "eese"

MilanGrubnic70

(?<=a)b  #=>   positive lookbehind: matches a "b" that IS preceded by an "a", using negative lookbehind. 
(?<!a)b  #=>   negative lookbehind: matches a "b" that IS NOT preceded by an "a", using negative lookbehind. 

MilanGrubnic70

def binary_search(target, array, low=0, high = (array.length-1))
  return -1 if low > high
  mid_point = (low + high)/2

  return mid_point if array[mid_point] == target

  if target < array[mid_point]
    high = mid_point - 1
  else
    low = mid_point + 1

MilanGrubnic70

def prime_factors(num)
  return [] if num == 1
  first_factor = (2..num).find{|x| num % x == 0}
  factors = prime_factors(num/first_factor)
  factors.unshift(first_factor)
end

#Test Driver Code:

puts prime_factors(1) == []

MilanGrubnic70

The yield Statement: Let's look at an example of the yield statement:

def test
   puts "You are in the method"
   yield
   puts "You are again back to the method"
   yield
end

MilanGrubnic70

def fibonacci_iterative(n)
  return 0 if n == 0
  prime = 0
  omega = 1
  (n-1).times do
    alpha = omega + prime
    prime = omega
    omega = alpha
  end
  return omega

MilanGrubnic70

# Implement an iterative version of the factorial function
def factorial_iterative(n)
  return 1 if n <= 1
  (1..n).inject {|product, num| product * num}
end

# Implement a recursive version of the factorial function
def factorial_recursive(n)
  return 1 if n <= 1
      n * factorial_recursive(n - 1)

MilanGrubnic70

#Sublime Text Shortcuts

CTRL-SHIFT-UP/DOWN => multiple cursors
CMD-D => select next occurences
CMD-CTRL-G => select all occurences of a word you can edit
OPT/ALT-ENTER = > find all
CTRL/TAB or CTRL/SHIFT/TAB => toggle tabs

FUNC-DELETE => delete forward