cache eval() result

Question

In Javascript, is it possible to cache the results of eval?

For example it would be great if I could:

var str="some code...";
var code = eval(str);
//later on...
code.reExecute();

Answer 1

You can make str the body of a function and use New Function instead of eval.

var fn = new Function([param1, param2,...], str);

And reuse it by calling fn(p1, p2,...)

Or use eval, and make str be something like

var fn = eval("(function(a){alert(a);})")

Answer 2

The result of the 'eval' call is to evaluate the javascript. Javascript (in browsers) does not offer any kind of 'compile' function.

The closest you could get (using eval) is:

var cached_func = eval('function() {' + str + '}');

Then you can call the cached_func later.