Free Ruby Association Ruby-Programmer-Gold Exam Questions

Question 1

In Ruby, the use of blocks is a fundamental concept for iterating over collections and executing code repeatedly. Examine the following Ruby code snippet:numbers = [1, 2, 3, 4, 5]sum = 0numbers.each { |number| sum += number }doubled = numbers.map { |number| number * 2 } Based on this code, which two of the following statements are true regarding the use and functionality of blocks?

A : The each block creates a new array with each number in numbers incremented by 1.

B : Both each and map blocks modify the original numbers array.

C : The each block increments sum by each number in the numbers array, resulting in the sum of all elements.

D : The map block modifies the original numbers array to contain each number doubled.

E : The map block returns a new array with each number in numbers doubled, leaving the original array unchanged.

Answer: C,E

Question 2

Review the following Ruby code snippet:def divide_numbers(x, y) x / yrescue ZeroDivisionError => e puts "Error: #{e.message}"end result1 = divide_numbers(10, 2)result2 = divide_numbers(10, 0)result3 = begin divide_numbers(10, '5') rescue TypeError => e "Caught: #{e.class}" endresult4 = divide_numbers(10, nil) rescue "Invalid operation" What will be the values of result1, result2, result3, and result4, respectively?

A : 5, nil, Caught: TypeError, Invalid operation

B : 5, Error: divided by 0, TypeError, TypeError

C : 5, ZeroDivisionError, Caught: TypeError, Invalid operation

D : 5, Error: divided by 0, Caught: TypeError, Invalid operation

Answer: D

Question 3

In Ruby, effectively using blocks is essential for controlling flow and data processing. Review the following Ruby code snippet:numbers = [1, 2, 3, 4, 5]sum = 0numbers.each { |number| sum += number }squared_numbers = numbers.map { |number| number ** 2 } Based on this code, which two of the following statements are correct about the blocks used in the context of the each and map methods?

A : The each block creates a new array containing each number squared.

B : The map block returns a new array with the square of each number, while the original numbers array remains unchanged.

C : Both each and map blocks modify the original numbers array.

D : The each block iteratively adds each number in the numbers array to sum, resulting in the sum of all numbers.

E : The map block modifies the original numbers array to contain the square of each number.

Answer: B,D

Question 4

Analyze the following Ruby code snippet that utilizes regular expressions for string processing:class EmailExtractor EMAIL_REGEX = /(\b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Z|a-z]{2,}\b)/ def self.extract_from(text) text.scan(EMAIL_REGEX).flatten endend text1 = "Contact us at support@example.com for assistance"text2 = "Send your feedback to: feedback@example.co.uk and admin@example.com"text3 = "No emails here!" result1 = EmailExtractor.extract_from(text1)result2 = EmailExtractor.extract_from(text2)result3 = EmailExtractor.extract_from(text3) What will be the values of result1, result2, and result3, respectively?

A : ["support@example.com"], ["feedback@example.co.uk", "admin@example.com"], []

B : ["support@example.com"], ["feedback@example.co.uk"], ["admin@example.com"], []

C : ["support@example.com"], nil, []

D : ["support@example.com"], ["feedback@example.co.uk", "admin@example.com"], nil

Answer: A

Question 5