Difference between revisions of "For"

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{{LSL Tip|Please read [[User:Kireji_Haiku/How_to_deal_with_lists_in_LSL|this intro of how to iterate over a list in LSL]].}}
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|notes=A for loop is the same as a while loop as below.
|notes=A for loop is the same as a while loop as below.

Revision as of 07:10, 21 December 2012

for( initializer; condition; incrementloop

•  initializer Executed once just before checking condition.
•  condition If this executes as true then loop is executed.
•  increment Executed after loop, then condition is checked again.
•  loop Can be either a single statement, a block statement, or a null statement.


Any of the statements can be null statements.

Specification

Conditional Types
Type Condition
integer True if it is not zero.
float True if it is not zero.[1]
string True if its length is not zero.
key True only if it is a valid key and not NULL_KEY.
vector True if the vector is not ZERO_VECTOR.
rotation True if the rotation is not ZERO_ROTATION.
list True if the length is not zero. Note that correct behavior is only seen with Mono-compiled scripts; LSO-compiled scripts incorrectly resolve to false if the list is non-empty: BUG-230728

Examples

<lsl> //single statement type. integer a = 0; integer b = 10; for(; a < b; ++a)

   llOwnerSay((string)a);

</lsl> <lsl> //block statement integer a = 0; integer b = 10; for(; a < b; ++a) {

   llOwnerSay((string)a);
   llOwnerSay((string)a);

} </lsl> <lsl> //null statement integer a = 0; integer b = 10; for(; a < b; llOwnerSay((string)(a++))); </lsl>

Notes

A for loop is the same as a while loop as below. <lsl> initializer; while(condition) {

   loop;
   increment;

} </lsl>


Deep Notes

Search JIRA for related Issues

Footnotes

  1. ^ The OpenSim LSL compiler will not do this implicitly. You will need to use an explicit check.