defined? function
Number of word 240
NoMethodError
ใๅ้ฟใใใฎใซๅญๅจใ็ขบ่ชใใใฐใใใจๆใฃใใใใฉใใใฎๆใฏdefined?
ใๅฅใงไฝฟใๅฟ ่ฆใใใ- ใใใใใชๆธใๆนใใใใฎใฏ้ฃใใ
# NoMethodError
if a.b.preset?
a.b(c)
end
defined?(bacon)
# nil