javascript - How to transform a String "a,b,c,d..." into a.b(c,d,...); for execution -

i have small multiplayer app working in websockets. application composed of game , chat object, each specific methods.

basically, client receives message string formatted : "object,method,arg1,arg2", example "chat,newmsg,foo bar", or "game,addplayer,name,level,team". first example should translated chat.newmsg("foo bar"); while second example game.addplayer(name,level,team); having difficulties doing writing message reader.

i trying figure out elegant solution, :

var msgreader = function(message){   msg=message.split(",");   msg[1].apply(msg[0],msg[2]); } 

but message can have many arguments, , can't quite figure out how handle that. me? not use eval() ^^

apply() expects array of arguments; if want pass arguments individually, use call().

however, apply() best in (in right use case), don't know number of arguments.

var msgreader = function (message) {     var props = message.split(",");     var obj = window[props[0]];      obj[props[1]].apply(obj, props.slice(2)); };  

apply() expects scope first parameter, provide obj. see documentation apply(), slice() , split().

1. this pass strings name, level, team etc, rather value of variables have names.

2. this only work if object wish invoke methods on global object.

   • if object wish target (a) isn't global, property on another object (b), change window reference b.

     var msgreader = function (message) {     var props = message.split(",");     var obj = b[props[0]];      obj[props[1]].apply(obj, props.slice(2)); };  

   • otherwise, you'll have either make object global, or add property object.