LSL Constants vs Globals

From Second Life Wiki

There are some advantages in using global variables over the string and key constants; it's faster and uses less bytecode when it is longer than 3 characters and is used more than twice, but it uses more bytecode when it is shorter than 3 characters or is used once. This is easily demonstrated by running the scripts in Figure 1.

Pros

• Faster
• Uses less bytecode when it is longer than 3 characters and it used more than twice.

Cons

• User can accidentally change the value.
• Uses more bytecode when it is shorter than 3 characters or it used once.

dead(){
    key a = NULL_KEY;
    key b = NULL_KEY;
    key c = NULL_KEY;
    key d = NULL_KEY;
}
 
default {
    state_entry() {
        llOwnerSay((string) llGetFreeMemory());
    }
}

key null_key = NULL_KEY;
 
dead(){
    key a = null_key;
    key b = null_key;
    key c = null_key;
    key d = null_key;
}
 
default {
    state_entry() {
        llOwnerSay((string) llGetFreeMemory());
    }
}