crpl:docs:removelistelement
Differences
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| Both sides previous revisionPrevious revisionNext revision | Previous revision | ||
| crpl:docs:removelistelement [2014/10/01 19:02] – external edit 127.0.0.1 | crpl:docs:removelistelement [2025/02/14 14:57] (current) – external edit 127.0.0.1 | ||
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| Line 1: | Line 1: | ||
| - | ~~DISCUSSION~~ | + | |
| <- [[crpl: | <- [[crpl: | ||
| ===== RemoveListElement | ===== RemoveListElement | ||
| Line 9: | Line 9: | ||
| === Description === | === Description === | ||
| Removes the list element at location '' | Removes the list element at location '' | ||
| + | |||
| + | Be careful when iterating over a list and using this command. If you delete list entries while looping over it, the deletions will move subsequent entries back, and the loop might fail to catch them all. | ||
| + | |||
| + | For example, if you try doing this: | ||
| + | |||
| + | < | ||
| + | CreateList ->list | ||
| + | " | ||
| + | |||
| + | <-list GetListCount 0 do | ||
| + | <-list I GetListElement 1 eq if | ||
| + | <-list I RemoveListElement | ||
| + | endif | ||
| + | loop | ||
| + | </ | ||
| + | |||
| + | The list output will combine into '' | ||
| + | |||
| + | To fix this, you want to do this: | ||
| + | |||
| + | < | ||
| + | CreateList ->list | ||
| + | " | ||
| + | |||
| + | 0 ->i | ||
| + | <-list GetListCount 0 do | ||
| + | <-list <-i GetListElement 1 eq if | ||
| + | <-list <-i RemoveListElement | ||
| + | <-i 1 sub ->i | ||
| + | endif | ||
| + | |||
| + | <-i 1 add ->i | ||
| + | loop | ||
| + | </ | ||
| + | |||
| + | Now, whenever we remove an element, we also push the current loop index back by 1, to make sure we catch all the elements inside the loop. The output combines into '' | ||
| === Examples === | === Examples === | ||
| < | < | ||
crpl/docs/removelistelement.1412190170.txt.gz · Last modified: 2025/02/14 14:56 (external edit)
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