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# 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

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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]:

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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:

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• What's the difference between equal?, eql?, ===, and ==?

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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

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# Happy birthday, Andrew!

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Data model

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

Concepts

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

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