IF

Provides conditional flow control depending on a boolean value.

Input stack: a [b]

Output stack: maybe b

IF will push the result [c] to the stack if a is 0.

PumpkinDB> 0x01 [0x20] IF
0x20
PumpkinDB> 0x00 [0x20] IF

Allocation

None

Errors

EmptyStack error if there are less than two items on the stack

InvalidValue error if the value being checked for truth is not a boolean.

Decoding error error if the code is undecodable.

Tests

works : 1 [2] IF 2 EQUAL?.
invalid_code : [1 1 IF] TRY UNWRAP 0x05 EQUAL?.
invalid_value : [5 [1] IF] TRY UNWRAP 0x03 EQUAL?.
requires_two_items_0 : [IF] TRY UNWRAP 0x04 EQUAL?.
requires_two_items_1 : [[] IF] TRY UNWRAP 0x04 EQUAL?.

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