| 268 | } |
| 269 | |
| 270 | public IPersistentMap without(Object key){ |
| 271 | int i = indexOf(key); |
| 272 | if(i >= 0) //have key, will remove |
| 273 | { |
| 274 | int newlen = array.length - 2; |
| 275 | if(newlen == 0) |
| 276 | return empty(); |
| 277 | Object[] newArray = new Object[newlen]; |
| 278 | System.arraycopy(array, 0, newArray, 0, i); |
| 279 | System.arraycopy(array, i+2, newArray, i, newlen - i); |
| 280 | return create(newArray); |
| 281 | } |
| 282 | //don't have key, no op |
| 283 | return this; |
| 284 | } |
| 285 | |
| 286 | public IPersistentMap empty(){ |
| 287 | return (IPersistentMap) EMPTY.withMeta(meta()); |