Free Ruby Association Ruby-Programmer-Gold Exam Questions

Question 1

In Ruby programming, the correct use and understanding of operators is essential. Analyze the following Ruby code snippet:a = 8b = 4result1 = a != bresult2 = a & b == 4result3 = (a * 2) / b Based on this code, which two of the following statements are true regarding the use and precedence of the operators?

A : result2 is true as the bitwise AND (&) operation has higher precedence than the equality (==) operator.

B : result1 evaluates to true because != checks if a and b are not equal.

C : result1 is false since != is a strict inequality operator and a is greater than b.

D : In result2, the equality (==) operation is evaluated before the bitwise AND (&) operation.

E : result3 equals 4 because division (/) has higher precedence than multiplication (*).

Answer: B,D

Question 2

Consider the following Ruby code snippet involving the implementation and usage of the Comparable module:class TimeRange include Comparable attr_reader :start_time, :end_time def initialize(start_time, end_time) @start_time = start_time @end_time = end_time end def (other) return nil unless other.is_a?(TimeRange) [start_time, end_time] [other.start_time, other.end_time] endend time_range1 = TimeRange.new(10, 20)time_range2 = TimeRange.new(15, 25)time_range3 = TimeRange.new(10, 20) result1 = time_range1 time_range3 What will be the values of result1, result2, and result3, respectively?

A : false, false, true

B : true, true, true

C : false, true, true

D : true, true, false

Answer: B

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

Examine the following Ruby code snippet that utilizes refinements:module LengthConversion refine String do def to_meters self.to_f / 3.281 end endend class MeasurementConverter using LengthConversion def convert_to_meters(length_in_feet) length_in_feet.to_meters endend converter = MeasurementConverter.newoutside_conversion = "10".to_meters result1 = converter.convert_to_meters("10")result2 = outside_conversion What will be the values of result1 and result2, respectively?

A : NoMethodError, NoMethodError

B : Approximately 3.048, Approximately 3.048

C : Approximately 3.048, NoMethodError

D : NoMethodError, Approximately 3.048

Answer: C

Question 5