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# "Each new term in the Fibonacci sequence is generated by adding the previous two terms. By starting with 1 and 2, the first 10 terms will be:
# 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, ...
# By considering the terms in the Fibonacci sequence whose values do not exceed four million, find the sum of the even-valued terms."
# Instructions:
# Construct a solution using Ruby that could be incorporated into a larger project. Solutions will be evaluated for readability, testability, and extensibility.
# Calculate sum of even-valued terms in fibonacci
class Fibonacci
attr_accessor :limit
def initialize(limit = 4_000_000)
@limit = limit
def even_sum
@a = 1
@b = 2
sum = 0
loop do
sum += @b if @b.even?
break if @b > limit
def advance
@a, @b = @b, @a + @b
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