rubymotion_predicate_in_action.rb

(main)> price_greater_than_200 = NSPredicate.predicateWithFormat("price > 200")
=> #<NSComparisonPredicate:0x1293bc50>
(main)> products.filteredArrayUsingPredicate(price_greater_than_200)
=> [#<Product:0x9b4f780 @name="iPad Mini" @price=329 @launched_on=2012-11-02 00:00:00 +0530>, #<Product:0x9b4fac0 @name="MacBook Pro" @price=1699 @launched_on=2012-06-11 00:00:00 +0530>, #<Product:0x9b4fe00 @name="iMac" @price=1299 @launched_on=2012-11-02 00:00:00 +0530>]
(main)> price_greater_than_equal = NSPredicate.predicateWithFormat("price >= 1299")
=> #<NSComparisonPredicate:0x9b1b740>
(main)> products.filteredArrayUsingPredicate(price_greater_than_equal)
=> [#<Product:0x9b4fac0 @name="MacBook Pro" @price=1699 @launched_on=2012-06-11 00:00:00 +0530>, #<Product:0x9b4fe00 @name="iMac" @price=1299 @launched_on=2012-11-02 00:00:00 +0530>]
(main)>> price_between = NSPredicate.predicateWithFormat("price BETWEEN {100 , 2000}")
=> #<NSComparisonPredicate:0x1293f3e0>
(main)> products.filteredArrayUsingPredicate(price_between)
=> [#<Product:0x9b4ddb0 @name="iPhone 5" @price=199 @launched_on=2012-09-21 00:00:00 +0530>, #<Product:0x9b4f780 @name="iPad Mini" @price=329 @launched_on=2012-11-02 00:00:00 +0530>, #<Product:0x9b4fac0 @name="MacBook Pro" @price=1699 @launched_on=2012-06-11 00:00:00 +0530>, #<Product:0x9b4fe00 @name="iMac" @price=1299 @launched_on=2012-11-02 00:00:00 +0530>]
(main)> name_begins_with = NSPredicate.predicateWithFormat("name BEGINSWITH[cd] 'i'")
=> #<NSComparisonPredicate:0x1293f660>
(main)> products.filteredArrayUsingPredicate(name_begins_with)
=> [#<Product:0x9b4ddb0 @name="iPhone 5" @price=199 @launched_on=2012-09-21 00:00:00 +0530>, #<Product:0x9b4f780 @name="iPad Mini" @price=329 @launched_on=2012-11-02 00:00:00 +0530>, #<Product:0x9b4fe00 @name="iMac" @price=1299 @launched_on=2012-11-02 00:00:00 +0530>]
(main)> name_contains =NSPredicate.predicateWithFormat("name CONTAINS[cd] 'i'")
=> #<NSComparisonPredicate:0x9b19050>
(main)> products.filteredArrayUsingPredicate(name_contains)
=> [#<Product:0x9b4ddb0 @name="iPhone 5" @price=199 @launched_on=2012-09-21 00:00:00 +0530>, #<Product:0x9b4f780 @name="iPad Mini" @price=329 @launched_on=2012-11-02 00:00:00 +0530>, #<Product:0x9b4fe00 @name="iMac" @price=1299 @launched_on=2012-11-02 00:00:00 +0530>]