How to use variables and functions that were previously announced

[saper639]

Hello! Explain how to use variables and functions that were previously announced.
Example:
function test() {
return 1;
}
var foo = 5;
var myData = new Parser()
.string('type', {length: 1, formatter: function(arr) {
console.log(foo);
console.log(test());
return arr;
}});
var buf = new Buffer('2D035958501', 'hex');
console.log(myData.parse(buf));

RefferenceError: foo is not defined
RefferenceError: test is not defined

[oparisy]

I could reproduce this behavior here:
https://tonicdev.com/568997e56065940c00b02848/568ab6588ec2e00c00160b3f

I am curious for an explanation, as it is my naive understanding that references to foo and test should indeed be captured in the closure of the anonymous function.

[tolmasky]

This seems to toString the function in question, hence why you are not trapping the closure. Its equivalent to something like this:

test2 = eval(test.toString())
test2() // no access to test1's closures.

The way I know this is that I made a custom toString to test it: https://tonicdev.com/tolmasky/568b78d93901db0d001ac249