Variables, function parameters, and return values have types. This means that a value stored in a variable, bound to a function parameter, or returned by a function must be of the same type, or it must be converted to the same type.
LSL provides a set of seven basic types that are used throughout the language:
| Type | Brief Description |
| integer | A whole number ranging from -2,147,483,648 to 2,147,483,647 |
| float | A decimal number ranging from 1.175494351E-38 to 3.402823466E+38 |
| vector | Three floats in the form < x , y , z >. Usually a position, color, or Euler rotation |
| rotation | A quaternion rotation, made up of 4 floats, < x , y , z , s > |
| key | A UUID (specialized string) used to identify something in SL, notably an agent, object, sound, texture, other inventory item, or dataserver request |
| string | A sequence of characters, limited only by the amount of free memory available to the script. |
| list | A heterogeneous list of the other data types. |
To convert between different types of values, use typecasting. An explicit typecast looks like this: ((newType)expression). Implicit typecasting will convert integers to floats or strings to keys.
For example, to say an integer, it must be converted to a string:
integer x = 5; llSay(0, (string)x);
| Constant | Value | Function |
| TYPE_INTEGER | 1 | Indicates that the list entry is holding an integer. |
| TYPE_FLOAT | 2 | Indicates that the list entry is holding a float. |
| TYPE_STRING | 3 | Indicates that the list entry is holding a string. |
| TYPE_KEY | 4 | Indicates that the list entry is holding a key. |
| TYPE_VECTOR | 5 | Indicates that the list entry is holding a vector. |
| TYPE_ROTATION | 6 | Indicates that the list entry is holding a rotation. |
| TYPE_INVALID | 0 | Indicates that this wasn’t a valid list entry. Occurs when passing an index greater than the length of the list or less than the negative length of the list. |
This function can be used to loosely determine the type of a variable. Make sure to improve it if you plan to use it for userdata.
// Writen by Chad Statosky
integer GetType(string var)
{
integer n = llGetListLength(llParseStringKeepNulls(var, ["1", "2", "3", "4"], [])) - 1;
n += llGetListLength(llParseStringKeepNulls(var, ["5", "6", "7", "8"], [])) - 1;
n += llGetListLength(llParseStringKeepNulls(var, ["9", "0", ".", "<"], [])) - 1;
n += llGetListLength(llParseStringKeepNulls(var, [">", " ", ",", "-"], [])) - 1;
if(n == llStringLength(var))
{
if(llSubStringIndex(var, "<") != -1 || llSubStringIndex(var, ">") != -1)
{
if(llGetListLength(llParseStringKeepNulls(var, [","], [])) == 3) return TYPE_VECTOR;
else return TYPE_ROTATION;
}
else
{
if(llSubStringIndex(var, ".") != -1) return TYPE_FLOAT;
else return TYPE_INTEGER;
}
}
else
{
if(llStringLength(var) == 36 &&
llGetListLength(llParseStringKeepNulls(var, ["-"], [])) == 5) return TYPE_KEY;
else return TYPE_STRING;
}
}
Credit to: Lslwiki.net (not working) with changes made for brevity and clarity.