如何在Ruby旅行费用程序中存储多组用户旅行相关输入？

Hey there! Nice progress on your trip cost calculator. The key here is to use an array of hashes—this lets you store each trip's details as a structured set of key-value pairs, and keep all those trips in a single collection you can easily access later.

First, let's fix a small bug in your current code: you're converting the trip location to an integer with to_i, but locations are strings (like "Paris" or "Tokyo")—that'll cause unexpected behavior! We'll fix that too.

Here's the updated code with proper data storage:

# Initialize an empty array to hold all trip data
trips = []

puts "How many trips did you take?"
trip_count = gets.chomp.to_i

trip_count.times do |x|
  puts "Where did you go for trip ##{x+1}?"
  trip_location = gets.chomp  # No to_i here—locations are strings!
  
  puts "How much did you spend on lodging?"
  lodging_cost = gets.chomp.to_i

  # Create a hash for this trip's details and add it to the trips array
  trip_details = {
    location: trip_location,
    lodging: lodging_cost
    # We can add more keys later for other expenses, like transportation!
  }
  trips << trip_details
end

Why this works: #

• The trips array acts as a container for every trip you record. Each entry in the array is a hash that stores specific details about one trip.
• Hashes let you label each piece of data (like :location or :lodging), so you can easily retrieve values later by their key.

Using the stored data later: #

Once you've collected all trips, you can loop through the array to display details, calculate totals, etc. For example:

# Calculate total lodging cost across all trips
total_lodging = trips.sum { |trip| trip[:lodging] }
puts "Total spent on lodging across all trips: $#{total_lodging}"

# Print each trip's details
puts "\nAll your trip details:"
trips.each_with_index do |trip, index|
  puts "Trip ##{index+1}: #{trip[:location]} | Lodging: $#{trip[:lodging]}"
end

Adding more expenses (like transportation): #

Since we're using hashes, expanding to include other costs is straightforward. Just add more prompts and hash keys:

trip_count.times do |x|
  # ... existing location and lodging prompts ...
  
  puts "How much did you spend on transportation?"
  transport_cost = gets.chomp.to_i

  trip_details = {
    location: trip_location,
    lodging: lodging_cost,
    transportation: transport_cost  # New key for transportation
  }
  trips << trip_details
end

This structure keeps your data organized and flexible as you add more features to your program!

内容的提问来源于stack exchange，提问作者Petrarahim Carnes