Trace Code to Final Output | Dataford Interview Questions

Your question is Trace Code to Final Output. Take a moment with it on the right.

Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).

Problem

Felix helps migrants send money home, and transfer fees vary by corridor, for example US to Mexico versus US to Colombia. A teammate wrote this quick script to build a set of fee calculator functions, one per corridor, and pasted it in a review channel asking whether it looks right.

corridors = ["US_MX", "US_CO", "US_GT"]
fee_calculators = []

for corridor in corridors:
    rate = 0.01 if corridor == "US_MX" else 0.02
    fee_calculators.append(lambda amount: amount * rate)

for calc in fee_calculators:
    print(calc(100))

Without running it, state exactly what this prints, line by line, and explain why, then say what you'd change so each corridor's calculator actually uses its own rate.

Your question is Trace Code to Final Output. Take a moment with it on the right.

Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).

corridors = ["US_MX", "US_CO", "US_GT"]
fee_calculators = []

for corridor in corridors:
    rate = 0.01 if corridor == "US_MX" else 0.02
    fee_calculators.append(lambda amount: amount * rate)

for calc in fee_calculators:
    print(calc(100))

Without running it, state exactly what this prints, line by line, and explain why, then say what you'd change so each corridor's calculator actually uses its own rate.