合并两个排序的数组不起作用

Question

Trying to solve a problem involving merging two sorted arrays without using the sort method. Here's my code so far:

def combine(arr1, arr2)
result = []

i = 0
arr1.each do |num|
    while num > arr2[i] && arr2[i] != nil
        result << arr2[i]
        i += 1
    end
    result << num
end

result
end

When I run this with [1, 9, 10, 12], [2, 5, 6, 8] as the two arguments, it gives me a comparison of Fixnum to nil error and I can't wrap my head around it. It seems like an easy fix but nothing seems to be working.

Answer 1

while num > arr2[i] && arr2[i] != nil

You are using the wrong condition. According to the short circuit rule of && , put the check for nil on the left:

while arr2[i] != nil && num > arr2[i]