Demonstrate why Error()'s are useless when callback queue is used

error_after_callback_return.js

var getValue = function(value, cb) {
	setTimeout(function err() {
		throw Error();	
	}, 0);
    return cb(null, value);
};

var result = getValue(5, (err, a) => {
    console.log(a);
});

process.exit();

// Output :5


var getValue = function(value, cb) {
	throw Error();	
    return cb(null, value);
};

var result = getValue(5, (err, a) => {
    console.log(a);
});

process.exit();

// throws Error()