TRY
Takes the topmost item and safely evaluates it as a PumpkinScript program on the current stack
Input stack: code
Output stack: [] or [description details code] (error closure)
TRY is a close relative of EVAL. It also evaluates
the closure but will not fail the program if there was an error.
Instead, it will push an error closure onto the stack. If no error
occurred, [] (an empty closure) will be pushed onto the stack.
PumpkinDB> [DUP] TRY SOME?
0x1
PumpkinDB> [1 DUP] TRY SOME?
0x1 0x1 0x0
Allocation
Allocates a copy of the code (this might change in the future) during the runtime. Allocates on program's heap when recovering from an error that occurred.
Errors
EmptyStack error if there is less than one item on the stack
Decoding error error if the code is undecodable.
Tests
works : [DUP] TRY SOME?.
invalid_code : 1 TRY UNWRAP 0x05 EQUAL?.
empty_stack : [TRY] TRY UNWRAP 0x04 EQUAL?.