Today I Learned about ruby logic

til.rb

# this:
if expected['value']
  variable = expected['value']
else
  variable = "default"
end

# is the same as this:
unless variable = expected['value']
  variable = "default"
end

###
# In the first example, `variable` is set to `expected['value']` if `expected['value']`
# is set and return false if it's not. Returning `false` will, of course, send the 
# program to the `else` condition, assigning `variable` to `"default"`.
#
# In the second it will set `variable` to `expected['value']` if it can, and "default"
# if the conditional evaluates `false`.
###