Question

How to use setInterval without using global variables? I’d prefer to wrap all variables of function invoked by setInerval in some kind of closure, like so:

var wrap = function (f){
 var local1, local2, ...;
 return function () { return f(); }
}

This doesn’t work, but the idea is that I’d pass wrap(f) instead of f to setInterval, so that locals for f are nicely wrapped and don’t pollute the global scope.

Answer 1

javascript don’t have dynamic binding.(except this keyword)

use anonymous function can archive your idea. (it called closure)

var fnc = function(){
    var local1, local2;

    return function(){
         // using local1, local2
    }
};

setInterval(fnc, 1000);