4rpl:commands:refexists
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| 4rpl:commands:refexists [2021/01/13 22:46] – virgilw | 4rpl:commands:refexists [2025/02/14 14:57] (current) – external edit 127.0.0.1 | ||
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| - | ~~NOTOC~~ | + | < |
| - | < | + | |
| + | ====== Variable Exists (by reference) ====== | ||
| + | |||
| + | ===== Syntax ===== | ||
| - | === Syntax === | ||
| -?! | -?! | ||
| - | === Description === | + | ===== Description ===== |
| - | Takes a string from the stack and uses it as a variable name. | + | |
| - | Checks to see if the variable exists (has been assigned). | + | Takes a string from the stack and uses it as a variable name. If the variable exists (has been assigned), |
| - | If so, 1 is pushed to the stack else 0. | + | |
| + | ===== Examples ===== | ||
| - | === Examples === | ||
| <code 4rpl> | <code 4rpl> | ||
| - | # Build a string by concatenating | + | "Santa isn't r-" ->secret |
| - | " | + | |
| - | -?! trace | + | |
| - | </code> | + | |
| + | if (" | ||
| + | "I know a secret" | ||
| + | else | ||
| + | "I know no secrets" | ||
| + | endif | ||
| + | </ | ||
| + | |||
| + | ~~NOTOC~~ | ||
4rpl/commands/refexists.1610577979.txt.gz · Last modified: 2025/02/14 14:56 (external edit)
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