Calling functions from a JSON Object

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Javascript

Hi,

I define the following json:

var testobj = {
    firstfunc: function(){
        return setInterval(this.testfunc, 1000);
    },
    testfunc: function(){
        console.log('test');
        this.otherfunc();
    },
    otherfunc: function(){
        console.log('otherfunc');
    }
}

if I call testobj.testfunc(), the console prints "test" and "otherfunc". Fine so far.

if I call firstfunc with a intervall, that calls "otherfunc" inside, the console prints: this.otherfunc is not a function.
But this.otherfunc is a function and works if I call it inside testfunc.