Sequential invocations to console.log yield varying outcomes

So, I'm feeling a bit perplexed by this situation. (and maybe I'm missing something obvious but...)

I have 2 consecutive calls to console.log. There is nothing else between them

console.log($state);
console.log($state.current);

and here's an image of the results

Why are the 2 "current" objects different? How is this possible?


Context:

These calls are within an ajax call while resolving route dependencies. Let me know if you need more code or context.

Observed the same issue in Chrome and Firefox

Ajax call and wrapper function (untouched)

normaCtrl.publicNorma = ['$http', '$state', '$stateParams', 'baseUrl', function ($http, $state, $stateParams, baseUrl)
{
    var id = $stateParams.id;
    return $http.get(baseUrl + "api/public/norma/" + id).then(
        function (response) {
            console.log($state);
            console.log($state.current);
            console.log($state.current.title);
            return response.data;
        }
    );
}];

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Answer №1

For those who come across this, here is the explanation you're looking for.

Brief Explanation

When dealing with deep mutable objects in JavaScript, console.log displays the object at its current state of execution, not at the state when console.log was called.

Further Insight

In simple terms, when you work with deeply nested objects and use console.log, it keeps a reference to that object instead of creating a copy.

Due to the delay between logging and display, when you expand the logged object, you are actually seeing the most up-to-date version of the object rather than the one from when console.log was invoked.

To ensure you capture an accurate "snapshot" of the object, consider using JSON.stringify or leveraging console.dir where applicable.

Answer №2

That's unusual. Could it possibly be an ECMA 5 object with a unique getter method causing this issue? It still doesn't quite explain the strange behavior with the plain $state call. My initial thought is that there might be something faulty with your GC...

Have you double-checked if these are indeed the calls being recorded in the log?

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