红宝石得到每一个nth元

红宝石nth元的阵列

# Ruby program to demonstrate the  
# accessing the elements of the array 
    
# creating string using [] 
str = ["GFG", "G4G", "Sudo", "Geeks"] 
    
# accessing array elements 
# using index 
puts str[1] 
    
# using the negative index 
puts str[-1]