LlGetListEntryType

Returns an integer that is the type of the entry index in src.

index supports negative indexes.
If index describes a location not in src then TYPE_INVALID is returned.

Indexes

This function has two primary uses: serializing a list to a string, debugging.

//A simple list serializer and deserializer.
//This will round floats to 6 decimal places and not handle strings with embedded "|" characters
 
string serialize(list input){
    integer len = ~llGetListLength(input);
    string build = (string)(~len);
    while(++len){
        build += "|" + llGetListEntryType(input, len) + 
                 "=" + llList2String(input, len);//very unsafe, list item could contain "|" character!!!
    }
    return build;
}
 
list deserialize(string input){
    integer len = ~(integer)input;//the length is everything before the "|", which is where (integer) stops
    list build = [];
    list pair = llParseString2List(input, ["|"], []);
    string value;
    list replace;
    while(++len){
        integer type = (integer)(value = llList2String(pair, len));
        value = llDeleteSubString(value, 0, llSubStringIndex(value, "="))
        if(TYPE_INTEGER == type)
            replace = [(integer)value];
        else if(TYPE_FLOAT == type)
            replace = [(float)value];
        else if(TYPE_STRING == type)
            replace = [value];
        else if(TYPE_KEY == type)
            replace = [(key)value];
        else if(TYPE_VECTOR == type)
            replace = [(vector)value];
        else if(TYPE_ROTATION == type)
            replace = [(rotation)value];
        pair = llListReplaceList(pair, replace, len, len);
    }
    return pair;
}

This snippet produces a LSL formatted dump of a list that can be pasted back into LSL.

//A list dumper that produces an output suitable for pasting back into LSL as a variable initialization.
//Originally By Talarus Luan
string list_dump(list mylist)
{
    string s = "[";
    integer i;
    integer t;
    for (i = 0; i < llGetListLength(mylist); ++i) 
    {
        if (i > 0) 
            s += ","; 
        t = llGetListEntryType(mylist,i); 
        if (t==4)
            s+= "(key)";
        if ((t == 3) || (t==4))  
            s += "\""; s += llList2String(mylist,i); 
        if ((t == 3) || (t==4))
            s += "\""; 
    }
    s += "]";
    return s;
}

For a more complex and robust list (de)serializer see TightListType.

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function integer llGetListEntryType( list src, integer index );