Thun/implementations/Prolog/docs/reference/nullary.md

(Combinator) Run a quoted program without using any stack values and leave the first item of the result on the stack. ... [P] nullary

## nullary (Combinator) Run a quoted program without using any stack values and leave the first item of the result on the stack. ... [P] nullary

        ... A

Definition

[stack] dip infra first

Derivation

... [P] nullary
... [P] [stack] dip infra first
... stack [P] infra first
... [...] [P] infra first
... [A ...] first
...  A

Discussion

A very useful function that runs any other quoted function and returns it's first result without disturbing the stack (under the quoted program.)

Crosslinks

unary binary ternary