Remove and return the first key-value pair.
(&mut self)
| 290 | |
| 291 | /// Remove and return the first key-value pair. |
| 292 | pub fn remove_first(&mut self) -> Option<(K, V)> { |
| 293 | if !self.keys.is_empty() { |
| 294 | let key = self.keys.remove(0); |
| 295 | let value = self.values.remove(0); |
| 296 | Some((key, value)) |
| 297 | } else { |
| 298 | None |
| 299 | } |
| 300 | } |
| 301 | |
| 302 | // ============================================================================ |
| 303 | // INSERT OPERATIONS |