javascript-this

Question 1

What is this in JavaScript?

Answer 1

a keyword that contains a value that is defined at call time

Question 2

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

Answer 2

it is available in a function’s code block even though it was never included in the function’s parameter list or declared with var.

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

this refers to the variable that it is being defined inside of

Question 5

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

Answer 5

whatever object is calling the function