Check out example codes for "ruby unless". It will help you in understanding the concepts better.
Code Example 1
unless number.even? # runs if `number` is NOT even else # runs if `number` is even end
Code Example 2
if condition expression
Code Example 3
x = 1 if x > 2 puts "x is greater than 2" elsif x <= 2 and x!=0 puts "x is 1" else puts "I can't guess the number" end
Learn ReactJs, React Native from akashmittal.com