ruby_array2.rb

arr1=[1,2,3,4,5]
arr2=[1,2,3,4,5]
arr3=[1,2,3,4]
arr4=[1,2,3,5]
arr5=[1000,2000,3000]
arr6=[1,2]
arr7=[2,1]
arr8=["hello", "world"]
arr9=["Hello", "World"]

# 0が返ってくる
p(arr1<=>arr2)	#1
# -1
p(arr3<=>arr1)	#2
# 1
p(arr4<=>arr3)	#3
# 1
p(arr5<=>arr4)	#4
# 1
p(arr7<=>arr6)	#5
# nil
p(arr8<=>arr7)	#6
# -1
p(arr9<=>arr8)  #7