javascript - Node.js getting around 'listener must be a function' error -

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• javascript: possible pass variable callback function assigned variable? 4 answers

i using node.js , steam-node write couple of bots steam (stored on array), each bot has own account , stuff. so, begin, here's part of code:

function onlogon(index){     console.log('[steam] logged in on bot ' + index);     bots[index].setpersonastate(steam.epersonastate.online);     /*do other stuff*/ }  (var = 0; < bots.length; i++){ /*foreach of bots, assign loggedon listener */     bots[i].on('loggedon', onlogon(i)); } 

and code giving me 'listener must function'. now, know error means, should set event listener this:

bots[i].on('loggedon', onlogon); 

but doesnt work, because need pass variable event.

i this:

for (var = 0; < accounts.length; i++){     bots[i].on('loggedon', function() {         console.log('[steam] logged in on bot ' + i);         bots[i].setpersonastate(steam.epersonastate.online);         //...     }); } 

but doesnt work because passed reference , throws typeerror: cannot read property 'setpersonastate' of undefined way.

bots[i].on('loggedon', (function(index) {         console.log('[steam] logged in on bot ' + i);         bots[index].setpersonastate(steam.epersonastate.online);         //...     })(i)); 

and doesn't work...

is there way want here? or should dont use arrays?

when run

bots[i].on('loggedon', onlogon(i)); 

you immediately calling onlogon, , passing result on. want bind first argument without calling it, can done follows:

bots[i].on('loggedon', onlogon.bind(null, i)); 

the null because first argument bind context (or this value), don't care about.