| Type | Wish | Status | reviewed | Date | 26-Oct-2010 23:08 |
|---|---|---|---|---|---|
| Version | alpha 109 | Category | Native | Submitted by | BrianH |
| Platform | All | Severity | minor | Priority | normal |
| Summary | FIND /same option |
|---|---|
| Description |
The /same option would search for the SAME? value in a block-like series, rather than an equivalent value. For other types that FIND applies to, /same would be a noop because the equivalence tested is the same one used by SAME? already. This should be even faster than a normal FIND. This request is partly in response to #1708. |
| Example code |
; Example code: find/same b :val ; Equivalent code: forall b [if same? :val first b [break/return b]] |
| Assigned to | n/a | Fixed in | - | Last Update | 2-Nov-2010 01:39 |
|---|
| Comments | |
|---|---|
|
(0002667)
maxim 26-Oct-2010 23:20 |
YESSSS
I've had to make this using a looped find and same? it is orders of magnitude faster on searches, when items from a dataset have to be searched in said dataset. example, to get the new index after some sorting algorithm, or to get a row from a db search when your criteria is the result of a query in that database. its also useful in GUIs to determine selection from a list which has several times the same text but from different sources. |
|
(0002668)
maxim 26-Oct-2010 23:28 |
this is much faster than above example
until [either (same? pick (r: find blk :val) 1 :val) [r][not blk: :r]] |
|
(0002669)
BrianH 26-Oct-2010 23:37 |
That would not be faster for blocks that contain a lot of references to equivalent but not the same object/module/block/whatever as the value you are looking for. The FIND does a full EQUAL?-style comparison, and enough of those add up quickly. SAME? is much faster than EQUAL?. |
|
(0002746)
maxim 2-Nov-2010 01:39 |
I know SAME? is faster, but going through REBOL loops was soo much slower than FIND that except for that specific case you gave, it was several hundred times faster in most cases, the larger the series, the bigger the difference.
having FIND/SAME would make that several times faster on ALL datatypes, which is why I'd be really happy for this wish to be granted. :-) |
| Date | User | Field | Action | Change |
|---|---|---|---|---|
| 2-Nov-2010 01:41 | maxim | Comment : 0002746 | Modified | - |
| 2-Nov-2010 01:39 | maxim | Comment : 0002746 | Added | - |
| 26-Oct-2010 23:37 | BrianH | Comment : 0002669 | Added | - |
| 26-Oct-2010 23:28 | carl | Status | Modified | submitted => reviewed |
| 26-Oct-2010 23:28 | maxim | Comment : 0002668 | Added | - |
| 26-Oct-2010 23:20 | maxim | Comment : 0002667 | Added | - |
| 26-Oct-2010 23:13 | BrianH | Description | Modified | - |
| 26-Oct-2010 23:11 | BrianH | Description | Modified | - |
| 26-Oct-2010 23:11 | BrianH | Code | Modified | - |
| 26-Oct-2010 23:08 | BrianH | Ticket | Added | - |