[iterati]

This is actually why I love working in Clojure. There are a number of threading macros to make this pipeline stuff work in different scenarios (put the return value in as the first, last, or variable argument; stop and return nil if you ever get a nil to prevent NPEs from happening downstream; only do this step is a condition is met). A simple example:

    (-> id
        get-account-details ;; {:plan "premium"}
        :plan               ;; "premium"
        get-plan-details    ;; {:price "$100.00"}
        :price)             ;; "$100.00"

It's equivalent to something like this in Python:

    account = get_account_details(id)          # {"plan": "premium"}
    plan_name = account.get("plan")            # "premium"
    plan_details = get_plan_details(plan_name) # {"price": "$100.00"}
    return plan_details.get("price")           # "$100.0"