Andrei Horak linkyndy

Data model

__call__ examples: http://stackoverflow.com/a/5824909/433940

Memoization: http://stackoverflow.com/a/5824909/433940

Singleton pattern: http://stackoverflow.com/q/6760685/433940

	# Canceling and reactivating Stripe subscriptions
	# https://stripe.com/docs/billing/subscriptions/canceling-pausing#reactivating-canceled-subscriptions

	subscription = Stripe::Subscription.create(customer: 'cus_XXX', items: [{ plan: 'XXX' }])

	# Cancel at period end
	subscription.delete(at_period_end: true)

	# Reactivate
	subscription.cancel_at_period_end = false

	def merge(a, b, c):
	# Result list
	d = []
	# Indices used for iterating through a, b and c
	i = j = k = 0
	# Calculate lengths just once
	lena, lenb, lenc = len(a), len(b), len(c)

	while i < lena and j < lenb and k < lenc:
	if a[i] <= b[j] and a[i] <= c[k]:

	def find_index(x, v, left=0, right=None):
	# Set `right` to a proper value for the first iteration
	if right is None:
	right = len(x)

	while left < right:
	mid = (left+right) // 2
	if v < x[mid]:
	right = mid
	else:

	class CreateClients < ActiveRecord::Migration
	def change
	create_table :clients do \|t\|
	t.string :type
	t.references :party, index: true
	t.references :master_client, index: true

	t.timestamps
	end
	end