.nil? .blank? .empty? .any? and .present?

	.nil?	.blank?	.empty?	.any?	.present?
nil	TRUE	TRUE	x	x	false
[]	false	TRUE	TRUE	false	false
{}	false	TRUE	TRUE	false	false
""	false	TRUE	TRUE	x	false
" "	false	TRUE	false	x	false
false	false	TRUE	x	x	false
99	false	false	x	x	TRUE
0	false	false	x	x	TRUE

x: NoMethodError

Reference

• .nil? .empty? .blank? .present? in Ruby on Rails