QUESTION 1 \"With the Date object, getTime() returns the number of milliseconds

Q: QUESTION 1 \"With the Date object, getTime() returns the number of milliseconds

1)True getTime() return the number of milliseconds since 1970/01/01. 2)False Magic Numbers usage should be avoided in code. 3)Option:c ====>Length of array - 1 (since array index starts with 0). 4)Option:a =====>To assign the value property selected by the user to the variable x,we use = document.getElementById('pies').value;

ID: 3819995 • Letter: Q

Question

QUESTION 1

"With the Date object, getTime() returns the number of milliseconds since January 1, 1970"

True

False

2 points

QUESTION 2

Using magic numbers in your code is a good practice.

True

False

2 points

QUESTION 3

The highest index in an array ____.

is the same as the length of the array

is one more than the length of the array

is one less than the length of the array

is set at 100 by Google

2 points

QUESTION 4

Ponder the select element. How would you assign the value property selected by the user to the variable x? (select1.gif)

<select id='pies'>
<option value ='cherry'>Cheerry</option>
<option value ='apple'>Apple</option>
<option value ='peach'>Peach</option>
</select>

x = document.getElementById('pies').value;

x = document.getElementById('f1').value;

x = document.f1.pies.value;

x = document.getElementById['pies'][2];

2 points

QUESTION 5

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

prototype

archetype

maker

penultimate

2 points

QUESTION 6

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

else

continue

break

default

2 points

QUESTION 7

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

pop()

push()

shift()

unshift()

2 points

QUESTION 8

"When you declare an array like the following, you _____. var cars = ["focus", "yaris", "mini"];"

are creating an array using a constructor function

are declaring an array using literal notation.

Incorrect

2 points

QUESTION 9

Which two instructions create a new array and assignes it to the variable n? Choose 2 answers.

Array[n];

Array(n);

var n = new Array();

var n = [];

2 points

QUESTION 10

What does the variable m hold after these lines execute?

var x = ["red", "orange", "yellow"", "green", "blue"];
m = x.splice(2, 2);

["red","yellow"]

["yellow","green"]

["red", "orange"]

"["orange","yellow"]

2 points

QUESTION 11

_____ is the name for the process of converting data into a format that can be stored or transmitted across a network and later recovered into the same format as the original.

Serialization

Normalization

Denaturization

Sequentation

2 points

QUESTION 12

This code is an example of ____.

if(document.getElementById) {
x = document.getElementById("box").value;
}
else {
x = document.form1.box1.value;
}

browser sniffing

browser detection

feature detection

magic number insertion

2 points

QUESTION 13

"Unlike the while statement, the statements in a _____ statement always execute at least once, before a conditional expression is evaluated."

do...continue

do...using

do...until

do...while

2 points

QUESTION 14

The splice() method _____. Choose 2 answers

allows removing elements from an array

allows adding elements to an array

joins two strings together

allows removing part of a string

2 points

QUESTION 15

Advantages of OOP are ____. Choose 3 answers.

code reuse

encapsulation

inheritance

automatic refactoring

2 points

QUESTION 16

Consider the code below. How do you read Joe's age into the variable y?

var people = [
{name: "stu", age: 23, height: 72},
{name: "sue", age: 29, height: 72},
{name: "joe", age: 33, height: 72},
{name: "moe", age: 42, height: 72}
];

y = joe.age;

y = people.joe;

y = people[3].age;

y = people[2].age;

2 points

QUESTION 17

What will the variable x hold after the loop finishes? var x = 1; for(var i = 0; i < 5; i++) { x = x + 2; }

none of the above

2 points

QUESTION 18

You cannot assign a JavaScript function to a variable.

True

False

2 points

QUESTION 19

"Consider the code below. How do your read the value of the width into a variable named w?"

var rect = {length: 9, width: 6};

w = width

w = rect[0]

w = rect.width

w = rect[1]

2 points

QUESTION 20

What is y after this executes? x = 3.14159; y = Math.floor(x)

3.2

3.1416

2 points

QUESTION 21

How many times will this loop execute?

x = 0;
sum = 0;

while(x < 4) {
sum = sum + 10;
}

infinity

2 points

QUESTION 22

You run this code in March 2014. what is m?

d = new Date();
m = d.getMonth();

Mar

March

2 points

QUESTION 23

What is displayed by the alert box?

var names = new Array(41, 22, 64, 98, 16, 22);
var index = 4;
alert(names[index]);

None of the above

2 points

QUESTION 24

Here 23 is called?

for(i = 0; i < 23; i += 2)

a magic number

a prototype

Incorrect

2 points

QUESTION 25

The ____ method removes and returns the first element from the beginning of an array.

split()

unshift()

shift()

slice()

2 points

QUESTION 26

The array join() method _____

converts an array of values into a string

breaks a string into an array of elements

joins two arrays together to make a larger array

joins two string together to make a larger string

2 points

QUESTION 27

In creating a data structure like this _____.

var rect = new Object();
rect.height = 9;

you have created a direct instance of an object

you have created an object using a custom constructor function

you have created an object literal

you have created an array literal

2 points

QUESTION 28

Math.random() produces a number ____.

from 0.0 up to but not including 1.0

from 0.0 up to and including 1.0

Incorrect

2 points

QUESTION 29

You have this form. Assume any necessary HTML is present. what happens if you click the 3rd radio button then click the ""click Me"" button? (radios1.gif)

nothing happens

the alert displays "sausage""

The alert displays "schrooms""

the alert displays "S"

2 points

QUESTION 30

An array is a useful JavaScript data structure.

True

False

2 points

QUESTION 31

How many times will this loop execute?

var x = 0;
for(var i = 5; i > 12; i++) {
x = x + 2;
}

2 points

QUESTION 32

In the array shown, the number 4 will be stored at index ____.

var temps = [1, 2, 4, 8, 16, 32];

2 points

QUESTION 33

How would you assign 'Wilma' to the variable n?

var names = new Array();
names[0] = ['Jose', 'Jones'];
names[1] = ['Wilma', 'Flintstone'];

n = names[0][0];

n = names[1][0];

n = names[0][1];

n = names[1][1];

2 points

QUESTION 34

A for-loop is sometimes called a counting loop

True

False

2 points

QUESTION 35

When you've created a data structure like this ____.

var rect = {length: 9, width: 6};

you have created a direct instance of an object

you have created an object using a custom constructor function

you have created an object literal

you have created an array literal

2 points

QUESTION 36

A ____ statement restarts a loop with a new iteration.

break

continue

default

2 points

QUESTION 37

What does this code produce?

var num = Math.random();
var d = num * 10 + 1;
d = Math.floor(d);

a random whole number betwen 0 and 10

a random whole number betwen 1 and 9

a random whole number betwen 1 and 11

a random whole number betwen 1 and 10

2 points

QUESTION 38

"Once a web page has finished loading, then the ____ event handler fires."

loaded

onload

complete

done

2 points

QUESTION 39

"When this runs what is the value of p?

function Pizza(toppings, diameter) {
this.numOfToppings = toppings;
this.size = diameter;

this.calcPrice = function() {
var c = this.numOfToppings + this.size;
return c;
};
}

var pie1 = new Pizza(2, 10);
var pie2 = new Pizza(3, 12);
var p = pie2.calcPrice();"

2 points

QUESTION 40

After this code runs, what is the length of this array?

var x = new Array();
x[0] = 5;
x[1] = 9;
x[5] = 2;

2 points

QUESTION 41

The following line calls the function named foo every 700 milliseconds. How do you make it stop?

t1 = setInterval("foo", 700);

it stops by itself after running once

call clearTimeout(t1);

call clearTimeout();

call clearTimeout('foo')

2 points

QUESTION 42

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

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

myCar.model(m);

m = myCar.model;

m = model.model;

m = model.myCar;

2 points

QUESTION 43

What is the value of x after these lines execute?

var names = new Array("Smith", "Jones", "Thomas", "Wilson", "Green");
var x = names.length;

2 points

QUESTION 44

Each repetition of a looping statement is called a(n) ____.

tag

point

renewn

iteration

2 points

QUESTION 45

When the following line runs an alert pops up saying "hello".

var m = function(){
alert("hello");
};

True

False

2 points

QUESTION 46

What does the variable m hold after these lines execute?

var x = ["red", "orange", "yellow", "green", "blue"];
m = x.slice(1, 4);

[ "orange", "yellow", "green", "blue"]

["red", "orange", "yellow", "green"]

["red", "orange", "yellow" ]

["orange", "yellow", "green"]

2 points

QUESTION 47

Your program has a button with an id = "b2". what does this code do?

document.getElementById("b2").onclick = function(){
alert("Yo!");
};

assigns an anonymous function to the onclick event of the button.

assigns a function named "alert" to the onclick event of the button.

when the button is clicked a message box with "alert" pops up.

2 points

QUESTION 48

After the for-loop ends the value of the variable nameFound will 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;
}

because Thomas is not spelled correctly

it is a law that all names must be lower case

the if-block test uses only 1 equal sign

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

2 points

QUESTION 49

What happens after this code runs?

r = ['red', 'rojo', 'ruby'];
r.push('rouge');

'rouge' is added to the beginning of the array at index 0

r will hold 'rouge' only, the other elements will be erased

'rouge' is added to the end of the array at index 3

'rouge' is added to the end of array at index 4

2 points

QUESTION 50

If you intend to create many identical object instances it is best to use an object constructor function you write to create the objects

True

False

is the same as the length of the array

is one more than the length of the array

is one less than the length of the array

is set at 100 by Google

Explanation / Answer

1)True

getTime() return the number of milliseconds since 1970/01/01.

2)False

Magic Numbers usage should be avoided in code.

3)Option:c ====>Length of array - 1 (since array index starts with 0).

4)Option:a =====>To assign the value property selected by the user to the variable x,we use = document.getElementById('pies').value;

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