ruby trick

blank and return if

def x()

return if param.blank?

=

def x()

if param.blank

return
end

run shell

sh 'rpec'

unshift

unshift will add a new item to the beginning of an array

arr = [1, 2, 3, 4,5,6]

arr.unshift(0) #=> [0, 1, 2, 3, 4, 5, 6]
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