Solution:Step 1: Understand method parametersThe method requires name and age, has optional city with default, and collects extra keyword arguments into extras.Step 2: Analyze method callThe call passes name, age, and extra keywords hobby and pet. These extras are merged into the profile hash.Step 3

[Solved] Given this method:def build_profile(name:, age:, city: "Unknown", **extras) profile = {name: name, age: age, city: city} profile.merge!... | Ruby

Ruby - Methods

Given this method:

def build_profile(name:, age:, city: "Unknown", **extras)
  profile = {name: name, age: age, city: city}
  profile.merge!(extras)
  profile
end

What will be the result of build_profile(name: "Bob", age: 25, hobby: "guitar", pet: "dog")?

A{:name=>"Bob", :age=>25, :city=>"Unknown", :hobby=>"guitar", :pet=>"dog"}

B{:name=>"Bob", :age=>25, :city=>"Unknown"}

CArgumentError: unknown keyword: hobby

D{:name=>"Bob", :age=>25, :city=>"Unknown", :extras=>{:hobby=>"guitar", :pet=>"dog"}}

Step-by-Step Solution

Solution:

Step 1: Understand method parameters
The method requires name and age, has optional city with default, and collects extra keyword arguments into extras.
Step 2: Analyze method call
The call passes name, age, and extra keywords hobby and pet. These extras are merged into the profile hash.
Step 3: Determine final hash
The returned hash includes all keys: name, age, default city, plus hobby and pet from extras.
Final Answer:
{:name=>"Bob", :age=>25, :city=>"Unknown", :hobby=>"guitar", :pet=>"dog"} -> Option A
Quick Check:
Extras merged into hash with defaults [OK]

Quick Trick: Use **extras to capture and merge extra keyword args [OK]

Common Mistakes:

MISTAKES

Expecting error on unknown keywords with **extras
Forgetting to merge extras into profile
Assuming extras stored under :extras key

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Given this method:

Step 1: Understand method parameters

Step 2: Analyze method call

Step 3: Determine final hash

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