How can a JavaScript developer modify a scalar global variable from within a function?

Question 16 options:

1)	Refer to the global variable by its name,

2)	Pass the global variable as an argument to the function.

3)	Use the global operator to declare the variable to be global.

4)	This is syntactically impossible.

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Question 17 (5 points)

What is the value of variable b after the following JavaScript fragment is evaluated? What is the value of a? a = 3; b = ++a * 4;

Question 17 options:

1)	The variable b is 16 and a is 3.

2)	The variable b is 16 and a is 4.

3)	The variable b is 12 and a is 4.

4)	The variable b is 12 and a is 3.

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Question 18 (5 points)

If two JavaScript objects are created using the same constructor, can the developer be certain they contain identical properties and methods. Why or why not?

Question 18 options:

1)	Yes, because they were created using the same constructor.

2)	The properties and methods will be the same, but the values may be different.

3)	No because properties and methods can be added or deleted dynamically.

4)	No because it depends upon how the constructor was called.

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Question 19 (5 points)

What is the difference between a JavaScript while statement and a do-while statement?

Question 19 options:

1)	The while statement is controlled by a loop variable or expression and do-while is a counter-controlled loop.

2)	The while statement defines a pretest loop and do-while defines a posttest loop.

3)	The while statement defines a posttest loop and do-while defines a pretest loop.

4)	The while statement is a counter-controlled loop and do-while is controlled by a loop variable or expression.

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Question 20 (5 points)

Given the ID of an HTML element, how can the JavaScript developer obtain a pointer to the element within the document object?

Question 20 options:

1)	Use the document.getElementPointer( ) method.

2)	Use the document.getElementById( ) method.

3)	Use the document.getPointer( ) method.

4)	Use the document.findElementById( ) method.

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