Given this method: ```ruby def config(options = {}) defaults = {host: 'localhost', port: 80} settings = defaults.merge(options) "Host: #{settings[:host]}, Port: #{settings[:port]}" end ``` What will be the output of `config(port: 3000)`?

hard📝 Application Q9 of 15

Ruby - Hashes

AHost: , Port: 3000

BHost: localhost, Port: 80

CHost: localhost, Port: 3000

DError: merge method undefined

Step-by-Step Solution

Solution:

Step 1: Understand hash merging behavior
defaults.merge(options) overwrites defaults with options keys.
Step 2: Substitute merged values in output
port is overwritten to 3000, host remains 'localhost'.
Final Answer:
Host: localhost, Port: 3000 -> Option C
Quick Check:
Hash merge overwrites keys from argument [OK]

Quick Trick: Use merge to override default hash values [OK]

Common Mistakes:

Expecting defaults to overwrite options
Confusing merge with merge!
Assuming error on merge call

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Given this method: ```ruby def config(options = {}) defaults = {host: 'localhost', port: 80} settings = defaults.merge(options) "Host: #{settings[:host]}, Port: #{settings[:port]}" end ``` What will be the output of `config(port: 3000)`?

Step 1: Understand hash merging behavior

Step 2: Substitute merged values in output

Final Answer:

Quick Check:

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