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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 | |
end | |
def even_sum | |
@a = 1 | |
@b = 2 | |
sum = 0 | |
loop do | |
sum += @b if @b.even? | |
advance | |
break if @b > limit | |
end | |
sum | |
end | |
private | |
def advance | |
@a, @b = @b, @a + @b | |
end | |
end | |
puts Fibonacci.new.even_sum |
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