javascript-this

Question 1

What is “this” in JavaScript?

Answer 1

“this” is an implicit parameter of all JavaScript functions.

Question 2

What does it mean to say that “this” is an “implicit parameter”?

Answer 2

It means the parameter is within the code block, even though it was not declared or named in the parameter list. But always accessible.

Question 3

When is the value of “this” determined in a function; call time or definition time?

Answer 3

Call time.

Question 4

How can you tell what the value of “this” will be for a particular function or method definition?

Answer 4

The value of “this” will be the object that is calling it.

Question 5

How can you tell what the value of “this” is for a particular function or method call?

Answer 5

The value of this will be in relation to who made the call.