Given a hash data = {name: "Eve", age: 28, city: "NY"}, how can you create an OpenStruct object and then add a new property country with value "USA" dynamically?

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Ruby - Metaprogramming Fundamentals

Given a hash data = {name: "Eve", age: 28, city: "NY"}, how can you create an OpenStruct object and then add a new property country with value "USA" dynamically?

Aperson = OpenStruct.new(data); person.country = "USA"

Bperson = OpenStruct.new; person = data; person.country = "USA"

Cperson = OpenStruct.new(data); person[:country] = "USA"

Dperson = OpenStruct.new; person.add(:country, "USA")

Step-by-Step Solution

Solution:

Step 1: Initialize OpenStruct with existing hash
Use OpenStruct.new(data) to create an object with properties from the hash.
Step 2: Add new property dynamically
Assign new property with dot notation: person.country = "USA".
Step 3: Check incorrect options
person = OpenStruct.new; person = data; person.country = "USA" overwrites person with hash, losing OpenStruct. person = OpenStruct.new(data); person[:country] = "USA" uses []= which is invalid. person = OpenStruct.new; person.add(:country, "USA") uses a non-existent method add.
Final Answer:
person = OpenStruct.new(data); person.country = "USA" -> Option A
Quick Check:
Initialize with hash + dot assign new property [OK]

Quick Trick: Initialize with hash, add properties by dot assignment [OK]

Common Mistakes:

Overwriting OpenStruct with hash
Using []= to add properties
Calling non-existent methods

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More Ruby Quizzes

Given a hash data = {name: "Eve", age: 28, city: "NY"}, how can you create an OpenStruct object and then add a new property country with value "USA" dynamically?

Step 1: Initialize OpenStruct with existing hash

Step 2: Add new property dynamically

Step 3: Check incorrect options

Final Answer:

Quick Check:

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