QUESTION 1 How many times will this loop execute? var x = 0; for(var i = 8; i >=

Question

  

QUESTION 1

How many times will this loop execute?

var x = 0;
for(var i = 8; i >= 3; i--) {
   x = x + 2;
}

6

7

5

0

QUESTION 2

"After the for-loop ends the value of the variable nameFound be false. Why?
var names = ['Smith', 'Jones', 'Thomas', 'Wilson', 'Green'];
for(i=0; i < names.length; i++) {
if(names[i] == 'Thomas')
  nameFound = true;
else
  nameFound = false;
}"

it is a law that all names must be lower case

the if-block test uses only 1 equal sign

because Thomas is not spelled correctly

"nameFound will be true the 3rd time through the loop, but will be overwritten as false for the 4th and 5th times"

5 points   

QUESTION 3

"When you declare an array like the following, you are declaring an array literal: var cars = ['focus', 'yaris', 'mini'];"

True

False

QUESTION 4

What's this?   x = {'name': 'Ralph', 'occupation': 'actor};

an object literal

an anonymous function

an array literal

an object constructor function

  

QUESTION 5

Using magic numbers in your code is a good practice (hint: it is not).

True

False

QUESTION 6

"Given this object, how would you assign the model to a variable named m?

var myCar = {make: 'Plymouth', model: 'Valiant', year: 1968}"

m = model.myCar;

m = model.model;

m = myCar.model;

myCar.model(m);

QUESTION 7

"What is displayed by the alert box?

var names = new Array(1, 2, 4, 8, 16, 32);
var index = 4;
alert(names[index]);"

4

2

8

None of these answers

QUESTION 8

If you intend to create many identical object instances it is best to use ____ to create the objects.

the direct instance method

the object literal method

the XHR instance method

an object constructor function you write

  

QUESTION 9

How many times will this loop execute?
x = 0;
sum = 0;
while(x < 4) {
   sum = sum + 10;
}

an infinite number

3

0

4

QUESTION 10

What will the variable x hold after the loop finishes?

var x = 1;
for(var i = 0; i < 5; i++) {
   x = x + 2;
}

11

8

6

9

QUESTION 11

You cannot assign a JavaScript function to a variable.

True

False

QUESTION 12

Each piece of data contained in an array is called a(n) ____

identament

quid

element

index

  

QUESTION 13

This program will produce an error. Why?  

var x;
for(var i = 0; i < 12; i++) {
   x = x + 2;
}

the variable i is illegally declared

the for-loop will never execute

this program will not produce an error

there is an attempt to read the value of x before x has been assigned a value

QUESTION 14

What is this?  

x = function() {
   y = 22/7;
   return y;
};

a prototype

a line that will produce a error

an anonymous function

an object constructor function

QUESTION 15

The ____ method adds one or more elements to the end of an array

pop()

push()

pull()

unshift()

  

QUESTION 16

Properties or methods added to the ____ object become available to all instances of this object's children.</

maker

prototype

archetype

penultimate

QUESTION 17

A ____ statement restarts a loop with a new iteration

continue

break

next

default

QUESTION 18

You use the ____ method of the String class to split a string into an indexed array

shift(}

split()

extract()

slice()

QUESTION 19

Each repetition of a looping statement is called an iteration.

True

False

QUESTION 20

A(n) ____ statement is used to exit control statements

quit

gotoline

break

continue

6

7

5

0

Explanation / Answer

1)6

2)"nameFound will be true the 3rd time through the loop, but will be overwritten as false for the 4th and 5th times"

3)False

4)an object constructor function

5)false

7)8

8)an object constructor function you write

9)infinite

10)11

11)false

12)element

13)there is an attempt to read the value of x before x has been assigned a value

15)push

17)continue

18)slice

19)True

20)break

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