One interview question

JavaScript
1 
var length = 10
function fn(){
    alert(this.length)
}
var obj = {
    length: 5,
    method: function(fn) {
        fn() // ?
        arguments[0]() // ?
    }
}
obj.method(fn)

I attended a junior interview and then i saw the reference answer：arguments[0] equivalent to fn .
Can someone explain that, I am a newbie, thank you.

2

Hi there, arguments is a magic variable for functions containing an array of arguments for the function. So arguments[0] would be the first argument of the function the code is inside of. So essentially in your code you’re calling the same function twice. Hope that explains it…

3

Thank you for your answer, I will insist on learning, until learned:slight_smile:

4

Right, arguments[0] is the first argument.

5

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