<=[[4rpl:start| Index]] ====== Variable Exists (by reference) ====== ===== Syntax ===== -?! ===== Description ===== Takes a string from the stack and uses it as a variable name. If the variable exists (has been assigned),1 (true) is pushed to the stack, otherwise 0 (false). ===== Examples ===== "Santa isn't r-" ->secret if ("secret" -?!) "I know a secret" Trace else "I know no secrets" Trace endif ~~NOTOC~~