passing function as parameter in lua issue

Solar2D Lua Language
#1

Hi everyone,

I have an issue on how can I pass functions as a parameter in Lua, below is my requirements:

inside main.lua:

function refreshCoins() end

showVungleAd(refreshCoins) – this call a function inside ads.lua

Inside ads.lua

function showVungleAd(action)

  vungleAds.show( “incentivized” )  – This is a call from third party plugin to deal with vungle ads

end

local function vungleAdListener( event ) end

now my question is here, how can I call my parametrized function inside the vungleAdListener?

#2

Following the trail… you have refreshCoins of type function, which is passed into showVungleAd as action.

This means action == refreshCoins == type is “function”.

So you can call it as action(), inserting params between the parenthesis if you need to.

Keep in mind that Lua only ever keeps one instance of a function in memory. When refreshCoins is passed into showVungleAd and picked up as the variable action, there is no copy of the function - it’s the exact same function as the original being called. (hope that made sense)

 

function showVungleAd(action)   vungleAds.show( "incentivized" )  -- This is a call from third party plugin to deal with vungle ads  action(params) end
#3

Hi,

If you put your listener inside the showVungleAd function, you should be able to do it like this:

--ads.lua function showVungleAd(action) local function vungleAdListener(event) action() end vungleAds.show("incentivized") end

I’ve never used Vungle ads, so I’m not sure how/where the listener is called.

-dev

#4

Normally, you would link your adListener in the init() call to the Vungle SDK.

If you want multiple paths from the adListener - to award various outcomes then add that code into the adListener event.

local ads = require( "ads" ) local function adListener( event ) if event.type == "adEnd" then --call your function here refreshCoins() end end ads.init( "vungle", "myAppId", adListener ) ... sometime later ... ads.show( "incentivized" )
#5

Following the trail… you have refreshCoins of type function, which is passed into showVungleAd as action.

This means action == refreshCoins == type is “function”.

So you can call it as action(), inserting params between the parenthesis if you need to.

Keep in mind that Lua only ever keeps one instance of a function in memory. When refreshCoins is passed into showVungleAd and picked up as the variable action, there is no copy of the function - it’s the exact same function as the original being called. (hope that made sense)

 

function showVungleAd(action)   vungleAds.show( "incentivized" )  -- This is a call from third party plugin to deal with vungle ads  action(params) end
#6

Hi,

If you put your listener inside the showVungleAd function, you should be able to do it like this:

--ads.lua function showVungleAd(action) local function vungleAdListener(event) action() end vungleAds.show("incentivized") end

I’ve never used Vungle ads, so I’m not sure how/where the listener is called.

-dev

#7

Normally, you would link your adListener in the init() call to the Vungle SDK.

If you want multiple paths from the adListener - to award various outcomes then add that code into the adListener event.

local ads = require( "ads" ) local function adListener( event ) if event.type == "adEnd" then --call your function here refreshCoins() end end ads.init( "vungle", "myAppId", adListener ) ... sometime later ... ads.show( "incentivized" )