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