apply

Applies a function.

sequence
  define sum a b
    +
      a
      b
  apply sum 1 2

It is usually used implicitely, as in

sequence
  define sum a b
    +
      a
      b
  sum 1 2

where flor figures out by itself it has to use this "apply" procedure to call the function.

rubyesque blocks

In Ruby, one case pass a block on a function call:

def f(i)
  i * yield
end
p f(5) { |j| 10 }

which just prints 50.

This can be achieved in flor like this:

define f i
  * i (yield _)
f 5
  10
echo f.ret

If one needs to have a "block" with parameters, it can be done by having an anonymous function definition has the only thing in the block:

define f i
  + i (yield i)
f 5
  def j
    * 3 j
f.ret #=> 20