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Js question
Hello, can someone explain why the code is outputing function? function foo() { return 2018; } foo.bar = "Programmers rule"; typeof foo; //function Thank you a lot.
7 ответов
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This really should be self-explanatory. Especially to someone who is level 15 like yourself.
Anyway, typeof will return the type of whatever thing you pass to it. You have created a function called foo, so when you say typeof foo, it will, of course, return function.
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David The difference is between :
typeof foo; //function
and
typeof foo(); // number
If you call the function (by adding the "()" to it), what you get is what it returns. If not, you just get what foo is - a function.
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It's added just for confusion and doesn't have any impact on the output. I guess what it does do is give a glimpse into the fact that functions are a type of object, and thus can have attributes.
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I've just seen your edit on your first comment, so let me refer you to this page I found. Hopefully it will help explain. https://www.dofactory.com/tutorial/javascript-function-objects
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Russ thanks. You explained it nicely. I will Check it out.
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Russ I know about the typeof thing is just that in some challenges typeof is the data type after the return keyword, btw, shouldnt this return objects, since functions are objects?
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Ah, I see. Its s lot clearer now. Also, does this bar property have any meaning here? Or is it added just for confusion?