Thun/docs/reference/VERTICAL-LINE•VERTICAL-LINE.md

## || Combinator Short-circuiting Boolean OR ### Definition > nulco [nullary] dip [true] branch ### Discussion Accept two quoted programs, run the first and expect a Boolean value, if it’s false pop it and run the second program (which should also return a Boolean value) otherwise pop the second program (leaving true on the stack.) [A] [B] || ---------------- A -> false B [A] [B] || ---------------- A -> true true ### Crosslinks &&