Difference between revisions of "ListXnotY"
Jump to navigation
Jump to search
(→Function: list ListXnotY(list {{LSL Param|lx}}, list {{LSL Param|ly}});: Reduces redundant llList2List calls, other minor optimisations) |
m (<lsl> tag to <source>) |
||
| (4 intermediate revisions by 2 users not shown) | |||
| Line 8: | Line 8: | ||
See also: [[List|Lists]] | See also: [[List|Lists]] | ||
< | <source lang="lsl2"> | ||
list ListXnotY(list lx, list ly) {// return elements in X list that are not in Y list | list ListXnotY(list lx, list ly) {// return elements in X list that are not in Y list | ||
list lz | list lz; | ||
integer i = | integer i = llGetListLength(lx); | ||
while(i--) | |||
if ( !~llListFindList(ly,llList2List(lx,i,i)) ) // * see Note | |||
lz += llList2List(lx,i,i); | |||
return lz; | return lz; | ||
} | } | ||
</ | </source> | ||
Note: If the if test is written as '''if (!~llListFindList''' ... , the result will be a list of elements in X that are ''missing'' from list Y. If it is written as '''if (~llListFindList''' ... , the result will be a list of elements in X that are ''present'' in list Y. | |||
Example:<br /> | Example:<br /> | ||
< | <source lang="lsl2"> | ||
list l1 = ["a","b","c","d"]; | list l1 = ["a","b","c","d"]; | ||
list l2 = ["a","1","b","2","c","3"]; | list l2 = ["a","1","b","2","c","3"]; | ||
list ListXnotY(list lx, list ly) {// return elements in X list that are not in Y list | list ListXnotY(list lx, list ly) {// return elements in X list that are not in Y list | ||
list lz | list lz; | ||
integer i | integer i = llGetListLength(lx); | ||
while(i--) | |||
if ( !~llListFindList(ly,llList2List(lx,i,i)) ) | |||
lz += llList2List(lx,i,i); | lz += llList2List(lx,i,i); | ||
return lz; | return lz; | ||
| Line 43: | Line 42: | ||
} | } | ||
} | } | ||
</ | </source> | ||
</div> | </div> | ||
Latest revision as of 14:25, 22 January 2015
| LSL Portal | Functions | Events | Types | Operators | Constants | Flow Control | Script Library | Categorized Library | Tutorials |
Function: list ListXnotY(list lx, list ly);
Show what x list has that y list is missing.
See also: Lists
list ListXnotY(list lx, list ly) {// return elements in X list that are not in Y list
list lz;
integer i = llGetListLength(lx);
while(i--)
if ( !~llListFindList(ly,llList2List(lx,i,i)) ) // * see Note
lz += llList2List(lx,i,i);
return lz;
}
Note: If the if test is written as if (!~llListFindList ... , the result will be a list of elements in X that are missing from list Y. If it is written as if (~llListFindList ... , the result will be a list of elements in X that are present in list Y.
Example:
list l1 = ["a","b","c","d"];
list l2 = ["a","1","b","2","c","3"];
list ListXnotY(list lx, list ly) {// return elements in X list that are not in Y list
list lz;
integer i = llGetListLength(lx);
while(i--)
if ( !~llListFindList(ly,llList2List(lx,i,i)) )
lz += llList2List(lx,i,i);
return lz;
}
default{
state_entry() {
llSay(0, "X list has this in it, but Y list doesn't: " + llList2CSV(ListXnotY(l1,l2)) );
//will say: d
}
}
Posted with the kind permission of Very Keynes, who originated this script June 2007 in the SL scripters forum http://forums-archive.secondlife.com/54/e4/194138/1.html