Updates:
Summary: Local variables of non-topmost stack frames cannot be inspected
Status: Accepted
Comment #4 on issue 2820 by [email protected]: Local variables of
non-topmost stack frames cannot be inspected
http://code.google.com/p/v8/issues/detail?id=2820
OK, so the issue here is:
Chrome DevTools doesn't allow you to inspect callers' local variables. I
guess it would be nice to have that functionality.
Workarounds in the meantime:
1) From the breakpoint, step line by line until you're back
in "myFunction"'s scope (where you can see the value of "param"), or even
further until you're back in the anonymous outer closure's scope (where "c"
is a local).
2) Use console.log to print both c (or param) and ret.
3) Refactor this callback passing style:
function myFunction(param, cb) { cb(some_expression_of(param)); }
myFunction(c, function callback(x) { do_something_with(x); });
to plain and simple imperative style:
function myFunction(param) { return some_expression_of(param); }
var x = myFunction(c); do_something_with(x);
Which will have x and c in the same local scope, and as a nice side effect
will probably also run a little faster.
4) In the example case at hand, you're probably looking for the difference
between "param^2" and "param*param" or "Math.pow(param, 2)" ;-)
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