present, blank, empty

limit = nil

limit.present?=> false

limit = 0
limit.present? => true

limit = 10

limit.present? => true

 

 limit = 'test'
limit.present? => true

 

limit = []
limit.present? => false

limit = ['test', 1]

limit.present? => true

---

limit = nil
 limit.blank?=> true

 limit = 1
limit.blank?=> false

limit = 'test' 
limit.blank?=> false

 limit = [] 
limit.blank?=> true

limit = [1]
 limit.blank?=> false
[31] pry(main)> limit = ['test']
=> ["test"]
[32] pry(main)> limit.blank?
=> false