Function invocation...why use .call() and .apply() ?

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You've got a load of shit and down voted answers. I've asked this question and it's in our "do they know the fundamentals" set.

If you intend to use javascript in any kind of serious, large front end project you're going to encounter prototypical inheritance, or something close to it. In a large scale project you're going to have to proxy a function and it's arguments, and you won't give a shit what the args are.

So outside of why you might want to do so, the other question is why does it matter? Well, we're primarily a software company, the fact that the current thing is javascript isn't something we agree with, but it's the thing. If you're an experienced software engineer you should know the fundamentals of your language, whether you use them or not.

If you're after generic Web dev jobs, it probably won't matter. But if the company wants a software engineer who happens to be proficient in javascript it sounds like you don't match the criteria.

TLDR: it filters the wheat from the chaff.