How to create a powerups system

Questions
#1

Hello I’m currently working on a small platformer game for some school coursework however I am stuck on how to develop a working powerups system as there dosen’t seem to be any tutorials that I can find. If you can help is welcome.

#2

Can you give examples of two powerups you’d like to implement? Also how will the user obtain them (pick-up, level-up, other?) and activate them (always on, special key combination, other condition?).

The general idea if there’s only like 5 or 10 powerups is probably to track which ones the user has in a Lua table. Something like:

function init(self)
	self.powerups = {
		doublejump = false,   -- player can double-jump
		blaster = false,  -- player can shoot laser beams
		bomb = false, -- player can plant bombs
	}
end

You change the state when the player picks up or otherwise acquires the powerup:

function on_message(self, message_id, message, sender)
	if message_id == hash("collision_response") and message.other_group == hash("blaster_powerup") then
		self.powerups.blaster = true
		go.delete(sender)	-- remove the powerup
	end
end

And then check against this table when the player tries to perform an action:

function on_input(self, action_id, action)
	if action_id == hash("shoot") and action.pressed and self.powerups.blaster then
		print("Zap!")
	end
end
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#3

I’m planning on including a powerup that gives the player a second dash. It’s only a small game for course work. However, the code that you have shared helps me a lot thank you.

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