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title empty？blank？nil？傻傻分不清楚

description empty？blank？nil？傻傻分不清楚

datetime 2014-11-11 10:39:28

tags ruby,rails

category coding

link rails-empty-vs-blank-vs-nil

file 2014-11-11-103928-rails-empty-vs-blank-vs-nil

template post

end

Method	nil?	if ()	empty?	any?	blank?	present?(!blank?)
Scope	ruby				rails only
Object	all		String, Array, Hash	Enumerable	all
nil	true	false	NoMethodError	NoMethodError	true	false
false	false	false	NoMethodError	NoMethodError	true	false
true	false	true	NoMethodError	NoMethodError	false	true
0	false	true	NoMethodError	NoMethodError	false	true
1	false	true	NoMethodError	NoMethodError	false	true
""	false	true	true	NoMethodError	true	false
" "	false	true	false	NoMethodError	true	false
[]	false	true	true	false	true	false
[nil]	false	true	false	false	false	true
{}	false	true	true	false	true	false
{ a:nil }	false	true	false	true	false	true

Refs