Closure instead of with

no-with.js

[dan@Dans-MacBook-Pro code]$ node
> var code = 'function printer (val) { return val; }; var result = printer(a); console.log(result);'
undefined
> eval(code)
ReferenceError: a is not defined
    at eval (eval at <anonymous> (repl:1:7), <anonymous>:1:62)
    at repl:1:2
    at REPLServer.self.eval (repl.js:110:21)
    at Interface.<anonymous> (repl.js:239:12)
    at Interface.EventEmitter.emit (events.js:95:17)
    at Interface._onLine (readline.js:202:10)
    at Interface._line (readline.js:531:8)
    at Interface._ttyWrite (readline.js:760:14)
    at ReadStream.onkeypress (readline.js:99:10)
    at ReadStream.EventEmitter.emit (events.js:98:17)
> (function () {
... var a = 1;
... eval(code);
... })();
1
undefined
> (function (ctx) {
... for (var k in ctx) {
..... eval('var ' + k + ' =ctx[k]')
..... }
... eval(code);
... })({ a: 1 });
1
undefined
>