VCMP: Simple spree system

spree <- array( 100, null );

class SpreeSys
{
    player = null;
    spree = 0;

    constructor( player )
    {
        if( typeof player != "instance" ) return;
        this.player = player;
        this.spree = 0;
    }
    function Get()
    {
        return [ this.spree, this.player ];
    }
    function Inc( amount = 1 )
    {
        this.spree += amount;
        local s = this.spree;
        if( s >= 5 && s%5 == 0 ) Start();
    }
    function Dec( amount )
    {
        this.spree -= amount;
    }
    function Start()
    {
        local s = this.spree, reward = s*100;
        ::Message( format( "%s is on a killing spree of %i kills in a row. Reward: %i.", this.player.Name, s, reward ) );
        this.player.Cash += reward;
    }
    function End( victim = null )
    {
        local spree = this.spree;
        if( spree >= 5 )
        {
            if( victim != null ) ::Message( format("%s has ended %s killing spree of %i kills in a row.", victim.Name, this.player.Name, spree ) );
            else ::Message( format("%s has ended their own killing spree of %i kills in a row.", this.player.Name, spree ) );
            this.spree = 0;
        }
        else this.spree = 0;
    }

}

function onPlayerJoin( player )
{
    spree[ player.ID ] = SpreeSys( player );
}

function onPlayerKill( killer, player, reason, bodypart )
{
    spree[ killer.ID ].Inc();
    spree[ player.ID ].End( killer );
}

function onPlayerTeamKill( killer, player, reason, bodypart )
{
    onPlayerKill( killer, player, reason, bodypart );
}

function onPlayerDeath( player )
{
    spree[ player.ID ].End();
}

function onPlayerPart( player, reason )
{
    spree[ player.ID ].End();
    spree[ player.ID ] = null;
}

function onPlayerCommand( player, cmd, text )
{
    if( cmd == "spree" )
    {
        local spree = ::spree, Buffer = "", hue;
        foreach( value in spree )
        {
            if( value == null ) continue;
             hue = value.Get();
            if( hue[0] >= 5 )
            {
                if( Buffer == "" ) Buffer = hue[1].Name + "(" + hue[0] + ")";
                else Buffer += " , " + hue[1].Name + "(" + hue[0] + ")";
            }
        }
        if( Buffer != "" ) MessagePlayer( "Players on spree: " + Buffer, player );
        else MessagePlayer("No players are currently on spree.", player );
    }
}