java 2

Question 1

java functions can be

Answer 1

built-in or customized

Question 2

java provides several built-in functions that have a rich collection of methods for performing

Answer 2

common math calculations, string manipulations, date manipulations, and array manipulations

Question 3

customized function template

Answer 3

function name (input parameters, if any) {
//function code
}

Question 4

three ways to return control to the point at which a function was invoked

Answer 4

• reaching function-ending right brace
• executing statement return;
• executing statement “return expression;” to return value of expression to caller script

Question 5

t/f: a function can be considered as an object and referenced by a variable

Answer 5

true

Question 6

function as object code

Answer 6

var obj = function(){
console.log(“Hello”);};

Question 7

a function without a name is an

Answer 7

anonymous function

Question 8

t/f: a function cannot be used as an argument to another function

Answer 8

false

Question 9

function as arg for another function

Answer 9

window.setTimeOut(obj, 5000);

Question 10

array

Answer 10

group of variables that have same name and are normally of same type

Question 11

individual variable in array is called

Answer 11

element

Question 12

refer to element in array by

Answer 12

giving array’s name followed by position number of element in square brackets

Question 13

t/f: first element in array is zeroth element

Answer 13

true

Question 14

5th element in array c is referred to as

Answer 14

c[4]

Question 15

find length attribute of array

Answer 15

arrayname.length

Question 16

java arrays are array _____

Answer 16

objects

Question 17

what operator is used to create new array and to specify number of elements in an array

Answer 17

new operator

Question 18

create new array ex

Answer 18

var n1 = [];
var n2 = new Array();
var n3 = [“Ford”, “Toyota”];

Question 19

6 array methods

Answer 19

• push
• pop
• shift
• concat
• sort
• indexOf

Question 20

push()

Answer 20

adds new element to end of array

Question 21

pop()

Answer 21

removes last element in array and returns the removed element

Question 22

shift()

Answer 22

removes first element in array and returns it

Question 23

concat()

Answer 23

concatenates two arrays into one

Question 24

sort()

Answer 24

sorts an array

Question 25

indexOf()

Answer 25

search array for an element and returns its position index

Question 26

var nums =[3, 6, 2]; console.log(nums.concat([3,5]));

Answer 26

//[3,6,2,3,5]

Question 27

java events

Answer 27

allow scripts to respond to user interactions and modify the page accordingly

Question 28

event examples

Answer 28

click, dblclick, change, submit, mouseover, mouseout

Question 29

java events and event handling help make ______

Answer 29

web applications more dynamic and interactive

Question 30

click

Answer 30

when user single-clicks HTML element

Question 31

dblclick

Answer 31

when user double-clicks element

Question 32

change

Answer 32

when user makes selection change in select element

Question 33

submit

Answer 33

when form's data is submitted

Question 34

mouseover

Answer 34

when mouse cursor enters an element, mouseover event occurs

Question 35

event handler

Answer 35

function that responds to an event

Question 36

registering an event handler

Answer 36

assigning an event handler to an event on a DOM node

Question 37

method addEventListener

Answer 37

can be called multiple times on a DOM node to register more than one event-handling method for an event

Question 38

if a script in head attempts to get a DOM node for an HTML element in the body,

Answer 38

getElementbyId returns null bc body has not yet been loaded

Question 39

window object

Answer 39

represents open window in browser

Question 40

if a document contains frames (