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JavaScript JavaScript Foundations Objects Prototypes: Part 1

Wen Ze Lee
Wen Ze Lee
4,209 Points
Posted by Wen Ze Lee
Wen Ze Lee
4,209 Points

should I add a var in front of jim when creating a new object with the Person constructor?

Hi!

Shouldn't the code be

var jim = new Person('Jim');

instead of

jim = new Person('Jim');

Are both cases allowed?

1 Answer

William Li
PLUS
William Li
Courses Plus Student 26,868 Points
William Li
William Li
Courses Plus Student 26,868 Points

Yes, both cases are allow because js is a pretty forgiving language.

Without going through the lecture, I can't be sure if jim has been initialized before, if not, then you're correct.

var jim = new Person('Jim');

is the right way to go. In the global scope, both lines should behave the same; but in some other case, omitting the var keyword can cause your program run into very strange behavior which maybe hard to debug.