matchItem test if object fulfils a constraint

Implemented by: Object,  Collection, Nil, Function

matchItem(item) may be passed to different objects that behave as constraints. More Objects may be conceived to implement matchItem to extend the interface.

See also: Dictionary matchAt.

implementations:

Object:matchItem(item)

Test if item is identical to object.

a = [1, 2, 3, "wort", "1", [pi, 2pi]];

a.any { |x| x.matchItem(3) }; // true

a.any { |x| x.matchItem(5) }; // false

a.any { |x| x.matchItem("wort") }; // false, because "wort" == "wort" but not identical.

Collection:matchItem(item)

Test if item is included in collection.

a = [1, 2, 3, "wort", "1", [pi, 2pi]];

a.any { |x| x.matchItem(pi) }; // true

Nil:matchItem(item)

returns true (Nil serves as a "joker", a stand-in for anything).

a = [nil, 1, 2, 3, "wort", "1", [pi, 2pi]];

a.any { |x| x.matchItem(10000.rand) }; // true always

Function:matchItem(item)

Test item by passing it to a function which should return a Boolean.

a = [10, 20, 30, { |item| item.isPrime }];

a.any { |x| x.matchItem(3) }; // true

a.any { |x| x.matchItem(4) }; // false

a.any { |x| x.matchItem(10) }; // true