In order to implement and statically type check OCL-like iterators, Kermeta includes some limited functional features by implementing lambda expressions.

This is typically used on Collection which provides operations that uses a function as parameter. For example : each , select , forAll , detect ...

Example 1 : the following code will build a collection of names of the operations that start with "test".

var names : Collection<String>
names := self.getMetaClass.classDefinition.ownedOperation
            .select{ op | op.name.indexOf("test") == 0}
            .collect{ op | op.name }
	    

Example 2 : Providing a time function on Integer

operation times(body : <Integer->Object>) : Void is do
    from var i : Integer init 0
    until i == self
    loop
        body(i)
        i := i + 1
    end
end

this allows to write code like :

var res : Integer
10.times { i | stdio.writeln(i.toString + ": Hello") } // Say 10 times Hello

See sections " Lambda Expressions and functions " and Lambda Expression for detailed informations.