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Ruby, calling a method with a block argument:

    anObject.methodTakingBlock { someObj.doSomethingHere }

or

    anObject.methodTakingBlock do
        someObj.doSomethingHere
    end

Smalltalk, calling a method with a block argument:

    anObject methodTakingBlock: [ someObj doSomethingHere ].

Ruby, implementing a method that takes a block argument (the lack of a named block variable and the "yield" keyword are a bit confusing, particularly if you associate "yield" with threads, which are not in play here.)

    def methodTakingBlock
        yield
    end

Smalltalk, implementing a method that takes a block argument.

    methodTakingBlock: aBlock
        aBlock value.

Ruby, calling a method with a block argument that takes two argument itself:

    anObject.methodTakingBlock { 
        |aVar, bVar| someObj.doSomethingHere(aVar, bVar) }

or

    anObject.methodTakingBlock do |aVar, bVar|
        someObj.doSomethingHere(aVar, bVar)
    end

Smalltalk, calling a method with a block argument that takes two arguments itself:

    anObject methodTakingBlock: [ :aVar :bVar | 
        someObj doSomethingHere: aVar andHere: bVar ].

Ruby, implementing a method that takes a block argument, giving the block the values 12 and 13 for the block's own arguments.

    def methodTakingBlock
        yield 12, 13
    end

An Ruby alternative syntax where the block argument is converted to a Proc object and is accessible via a named parameter:

    def methodTakingBlock(&aProc)
        aProc.call(12,13)
    end

Smalltalk, implementing a method that takes a block argument, giving the block values 12 and 13 for its own arguments.

    methodTakingBlock: aBlock
        aBlock value: 12 value: 13.