// Stick to ladder.
        void Stick()
        {
            // Put the Ladder class of the ladder in the ladder variable.
            ladder = hitLadder.GetComponent <Ladder>();

            // Make sure the player is considered on a ladder.
            player.OnLadder();

            // If the player is allowed to jump...
            if (ladder.allowJump)
            {
                // ... if the player is allowed to double jump...
                if (ladder.allowDoubleJump)
                {
                    // ... reset the amount of jumps that can be performed.
                    player.ResetJumps();
                    // Or else...
                }
                else
                {
                    // ... set the total jumps allowed to 1.
                    player.SetJumps(1);
                }
                // Or else...
            }
            else
            {
                // ... set the total amount of jumps to 0.
                player.SetJumps(0);
            }
        }