Why is this undefined in this code?

Question

JavaScript

Why is this undefined on line 11?
On line 12, as I understand it, the function f is called in the context of this, where this is f1000 and f1500 But when I try to look at this (line 11), I get not f1000 and f1500 , but undefined https://jsfiddle.net /6c4bhrqs/f.apply(this, arguments)

Answer 1

In short, because the context of the call f1000is undefined
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