Dear friends today's I'm going to share oDesk JavaScript 1.8 Test answer. So learn & pass the test easily.
Analyze
the following code snippet. What will be the output of this code?
<html>
<body>
<script type="text/javascript">
var str = "The drain of the plane is plain";
var patt1 =/ain/g;
document.write(str.match(patt1));
</script>
</body>
</html>
a.
1
b.
ain
c.
7,29
d.
7
e.
ain,ain
Which
of the following is the correct syntactical representation of a
generator expression in JavaScript?
a.
var doubles = [i * 2 for (i in it)];
b.
var doubles = [i * 2 for [i in it]];
c.
var doubles = (i * 2 for (i in it));
d.
var doubles = {i * 2 for (i in it)};
What
is the output of the following JavaScript code?
s2 = new String("2 + 2")
document.write(eval(s2));
s2 = new String("2 + 2")
document.write(eval(s2));
a.
4
b.
2+2
c.
Error
d.
None of the above
Consider
the following code snippet. Which of the given options would be used
in E4X to change the color of the descendant node chair?
var element = <Home>
<Room>
<Furniture>
<chair color="Brown"/>
</Furniture>
</Room>
</Home>
var element = <Home>
<Room>
<Furniture>
<chair color="Brown"/>
</Furniture>
</Room>
</Home>
a.
element.chair.color="light brown"
b.
element.chair.@color="light brown"
c.
element..chair.@color="light brown"
Consider
the code snippet below. Which of the given options represents the
correct sequence of outputs when this code is executed in E4X?
var p1 = <p>Kibology for all.</p>;
alert(p1.name().uri);
default xml namespace = 'http://www.w3.org/1999/xhtml';
var p2 = <p>Kibology for all.</p>;
alert(p2.name().uri);
default xml namespace = '';
var p3 = <p>Kibology for all.</p>;
alert(p3.name().uri);
var p1 = <p>Kibology for all.</p>;
alert(p1.name().uri);
default xml namespace = 'http://www.w3.org/1999/xhtml';
var p2 = <p>Kibology for all.</p>;
alert(p2.name().uri);
default xml namespace = '';
var p3 = <p>Kibology for all.</p>;
alert(p3.name().uri);
a.
'',http://www.w3.org/1999/xhtml,''
b.
'','',''
d.
None of the above
Which
of the following is not a valid JavaScript operator?
a.
*=
b.
/=
c.
%=
d.
^+
Which
of the following is not a valid String method?
a.
link()
b.
italics()
c.
str()
d.
sup()
Which
of the following methods is used to add and/or remove elements from
an array and modify them in place?
a.
push
b.
slice
c.
join
d.
splice
In
JavaScript, the encodeURI() function is used to encode special
characters. Which of the following special characters is/are an
exception to that rule?
a.
£
b.
€
c.
@
d.
$
e.
a and b
f.
c and d
Which
of the following is not a valid Date Object method in JavaScript?
a.
parse()
b.
setDay()
c.
setTime()
d.
valueOf()
Which
of the following results is returned by the JavaScript operator
"typeof" for the keyword "null"?
a.
function
b.
object
c.
string
d.
number
Which
of the following can be used to create attribute values by placing
variables and expressions within them?
a.
[]
b.
()
c.
{}
d.
<>
What
will the function NaN return for the condition NaN == NaN?
a.
true
b.
false
c.
error
d.
0
Which
of the following modifiers must be set if we use the Javascript
lastIndex Object Property during pattern matching?
a.
i
b.
m
c.
g
d.
s
Which
of the following two JavaScript code snippets is the more efficient
and why?
CODE SNIPPET 1
<script language="javascript">
for(i=0;i<document.images.length;i++)
document.images[i].src="blank.gif";
</script>
CODE SNIPPET 2
<script language="javascript">
var theimages = document.images;
for(i=0;i<theimages.length;i++)
theimages[i].src="blank.gif";
</script>
CODE SNIPPET 1
<script language="javascript">
for(i=0;i<document.images.length;i++)
document.images[i].src="blank.gif";
</script>
CODE SNIPPET 2
<script language="javascript">
var theimages = document.images;
for(i=0;i<theimages.length;i++)
theimages[i].src="blank.gif";
</script>
a.
Both codes are equally efficient.
b.
The first code is more efficient because it contains less code.
c.
The first code is more efficient because it employs object caching.
d.
The second code is more efficient because it employs object caching.
Which
of the following is used to solve the problem of enumerations in
JavaScript?
a.
let
b.
Regex
c.
Generators
d.
E4X
Is
the following statement regarding expression closures in JavaScript
true or false?
The syntax function(x) {return x*x;} can be written as function(x) x*x.
The syntax function(x) {return x*x;} can be written as function(x) x*x.
a.
True
b.
False
Which
of the given options represents the correct length when
alert(Emp..*.length()); is applied to the following code?
var Emp = <Emp>
<name>Mark</name>
<likes>
<os>Linux</os>
<browser>Firefox</browser>
<language>JavaScript</language>
<language>Python</language>
</likes>
</Emp>
var Emp = <Emp>
<name>Mark</name>
<likes>
<os>Linux</os>
<browser>Firefox</browser>
<language>JavaScript</language>
<language>Python</language>
</likes>
</Emp>
a.
11
b.
5
c.
6
d.
12
Analyze
the following code snippet. What will be the output of this
code?
<html>
<body>
<script type="text/javascript">
var str = "Visit Gardens(now)";
var patt1 = new RegExp("(now)", "g");
patt1.test(str);
document.write(RegExp.lastParen);
</script>
</body>
</html>
<html>
<body>
<script type="text/javascript">
var str = "Visit Gardens(now)";
var patt1 = new RegExp("(now)", "g");
patt1.test(str);
document.write(RegExp.lastParen);
</script>
</body>
</html>
a.
now
b.
(now)
c.
15
d.
19
Which
of the following is the correct way to create an XML object in E4X?
a.
var languages = new XML('JavaScriptPython');
b.
var languages XML = new XML('JavaScriptPython');
c.
var languages =
JavaScript
Python
;
JavaScript
Python
;
d.
All of the above are correct.
e.
a and c
f.
b and c
Which
of the following Array methods in JavaScript runs a function on every
item in the Array and collects the result from previous calls, but in
reverse?
a.
reduce()
b.
reduceRight()
c.
reverse()
d.
pop()
Which
of the following can be achieved using JavaScript?
a.
Reading or writing from external files
b.
Accessing or modifying browser settings
c.
Launching the default email application of the client
d.
All of the above can be achieved using JavaScript.
Which
of the following objects is the top-level object in the JavaScript
hierarchy?
a.
Navigator
b.
Screen
c.
Window
d.
Document
Which
of the following Javascript Regular Expression modifiers finds one or
more occurrences of a specific character in a string?
a.
?
b.
*
c.
+
d.
#
Which
of the following is the correct syntax for using the Javascript
exec() object method?
a.
RegExpObject.exec()
b.
RegExpObject.exec(string)
c.
RegExpObject.exec(parameter1,parameter2)
d.
None of the above
Analyze
the following code using the source property of Regular Expressions.
What will be the output of the below code
snippet?
<html>
<body>
<script type="text/javascript">
var str = "Visit Garden\Showcase";
var patt1 = new RegExp("en\S","g");
document.write("The regular expression is: " + patt1.source);
</script>
</body>
</html>
<html>
<body>
<script type="text/javascript">
var str = "Visit Garden\Showcase";
var patt1 = new RegExp("en\S","g");
document.write("The regular expression is: " + patt1.source);
</script>
</body>
</html>
a.
The regular expression is: en\S
b.
The regular expression is: 11
c.
The regular expression is: enS
d.
The regular expression is: 10
Which
of the following options can be used for adding direct support for
XML to JavaScript?
a.
E4X
b.
regex
c.
Generators and Iterators
d.
let
Which
of the following options is used to access the attributes in E4X?
a.
@
b.
::
c.
#
d.
*
Which
of the following statements regarding let in JavaScript is not
correct?
a.
The let definition defines variables whose scope is constrained to
the block in which they're defined. This syntax is very much like the
syntax used for var.
b.
The let expression lets you establish variables scoped only to a
single expression.
c.
The let keyword provides a way to associate values with variables
within the scope of a block, and affects the values of like-named
variables outside the block.
d.
You can use let to establish variables that exist only within the
context of a for loop.
Which
of the following are not global methods and properties in E4X?
a.
ignoreComments
b.
ignoreWhiteSpace
c.
setName()
d.
setNamespace()
e.
a and b
f.
c and d
What
will be the output of the following code?
var x = 5;
var y = 0;
document.write( let(x = x + 10, y = 12) x+y + ",");
document.write(x+y);
var x = 5;
var y = 0;
document.write( let(x = x + 10, y = 12) x+y + ",");
document.write(x+y);
a.
27,5
b.
22,5
c.
27,22
d.
None of the above
Which
of the following is not a valid method in generator-iterator objects
in JavaScript?
a.
send()
b.
throw()
c.
next()
d.
stop()
Using
the concept of "iterators" and "generators" in
JavaScript, what will be the output of the following code?
function testGenerator()
{
yield "first";
document.write("step1");
yield "second";
document.write("step2");
yield "third";
document.write("step3");
}
var g = testGenerator();
document.write(g.next());
document.write(g.next());
function testGenerator()
{
yield "first";
document.write("step1");
yield "second";
document.write("step2");
yield "third";
document.write("step3");
}
var g = testGenerator();
document.write(g.next());
document.write(g.next());
a.
firststep1second
b.
step1step2
c.
step1
d.
step1step2step3
Which
of the following DOM objects can be used to determine the resolution
of the screen?
a.
It is not possible to determine the resolution of the screen.
b.
Screen object
c.
Document object
d.
Window object
e.
None of the above
Analyze
the following code snippet. What will be the output of this
code?
<html>
<body>
<script type="text/javascript">
var str = "The rose";
var patt1 = new RegExp("rose", "g");
patt1.test(str);
document.write("rose found. index now at: " + patt1.lastIndex);
</script>
</body>
</html>
<html>
<body>
<script type="text/javascript">
var str = "The rose";
var patt1 = new RegExp("rose", "g");
patt1.test(str);
document.write("rose found. index now at: " + patt1.lastIndex);
</script>
</body>
</html>
a.
rose found. index now at: 5
b.
rose found. index now at: 4
c.
rose found. index now at: 8
d.
No output
Which
of the following options can be used to delete a child node of an XML
object in E4X?
a.
delete xmlobject.child;
b.
delete xmlobject.child[0];
c.
delete xmlobject.@attribute;
d.
All of the above
Analyze
the following code snippet, which uses a Javascript Regular
Expression Character Set. What will be the output of this
code?
<html>
<body>
<script type="text/javascript">
var str = "Is this enough?";
var patt1 = new RegExp("[^A-J]");
var result = str.match(patt1);
document.write(result);
</script>
</body>
</html>
<html>
<body>
<script type="text/javascript">
var str = "Is this enough?";
var patt1 = new RegExp("[^A-J]");
var result = str.match(patt1);
document.write(result);
</script>
</body>
</html>
a.
I
b.
Is
c.
s
d.
I,s,
Consider
the code below. What will be the final value of the variable
"apt"?
var apt=2;
apt=apt<<2;
var apt=2;
apt=apt<<2;
a.
2
b.
4
c.
6
d.
8
e.
16
Is
the following statement true or false?
A function becomes a generator if it contains one or more yield statements.
A function becomes a generator if it contains one or more yield statements.
a.
True
b.
False
What
does the following JavaScript code do?
<html>
<body>
<script type="text/javascript">
function validate()
{
var chk="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
var ok="yes";
var temp;
var field1=document.getElementById("t1");
var field=field1.value.substring(field1.value.length-1,field1.value.length);
if(chk.indexOf(field)=="-1")
{
alert("error");
field1.value=(field1.value).slice(0,field1.value.length-1);
}
}
</script>
<input type="text" id="t1" onkeyup="validate()" onkeypress ="validate()"/>
</body>
</html>
<html>
<body>
<script type="text/javascript">
function validate()
{
var chk="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
var ok="yes";
var temp;
var field1=document.getElementById("t1");
var field=field1.value.substring(field1.value.length-1,field1.value.length);
if(chk.indexOf(field)=="-1")
{
alert("error");
field1.value=(field1.value).slice(0,field1.value.length-1);
}
}
</script>
<input type="text" id="t1" onkeyup="validate()" onkeypress ="validate()"/>
</body>
</html>
a.
The code will cause an error alert to be displayed if a numeric
character is entered, and the numeric character is removed.
b.
The code will cause an error alert to be displayed if a non-numeric
character is entered, and the non-numeric character is removed.
c.
The code will cause an error alert to be displayed if a numeric
character is entered, and the value of textbox is reset.
d.
The code will cause an error alert to be displayed if a non-numeric
character is entered, and the value of textbox is reset.
Analyze
the following code snippet. What will be the output of this
code?
<html>
<body>
<script type="text/javascript">
var str = "Visit Gardens(now)";
var patt1 = new RegExp("(now)", "g");
patt1.test(str);
document.write(RegExp.lastParen);
</script>
</body>
</html>
<html>
<body>
<script type="text/javascript">
var str = "Visit Gardens(now)";
var patt1 = new RegExp("(now)", "g");
patt1.test(str);
document.write(RegExp.lastParen);
</script>
</body>
</html>
a.
no
b.
(no)
c.
15
d.
19
Which
of the following is the correct method for getting the date of
February 1 of the current year into a variable called "newDate"?
a.
var d = new Date();
newDate=new Date(d.getFullYear(), 1, 2);
newDate=new Date(d.getFullYear(), 1, 2);
b.
var d = new Date();
newDate=new Date(d.getFullYear(), 2, 1);
newDate=new Date(d.getFullYear(), 2, 1);
c.
var d = new Date();
newDate=new Date(d.getFullYear(), 1, 1);
newDate=new Date(d.getFullYear(), 1, 1);
d.
var d = new Date();
newDate= (d.getFullYear(), 1, 1);
newDate= (d.getFullYear(), 1, 1);
Which
of the following can be used to create attribute values by placing
variables and expressions within them?
a.
[]
b.
()
c.
{}
d.
<>
Which
of the following Javascript
Regular Expression Character Classes finds any non-digit character in
a given string?
a.
\W
b.
\S
c.
\B
d.
\D
Which
of the following objects in JavaScript contains the collection called
"plugins"?
a.
Location
b.
Window
c.
Screen
d.
Navigator
Which
of the following Javascript Regular Expression object methods is used
to search a string for a specified value and return the result as
true or false?
a.
exec()
b.
compile()
c.
return()
d.
test()
Which
of the following methods is not a valid Array object method in
JavaScript?
a.
reverse
b.
shift
c.
unshift
d.
splice
e.
All of the above are valid.
In
an HTML page, the form tag is defined as follows:
<form onsubmit="return Validate()" action="http://www.mysite.com/">
The validate() function is intended to prevent the form from being submitted if the name field in the form is empty. What will the validate() function look like?
<form onsubmit="return Validate()" action="http://www.mysite.com/">
The validate() function is intended to prevent the form from being submitted if the name field in the form is empty. What will the validate() function look like?
a.
<script type="text/javascript">
function Validate()
{
if(document.forms[0].name.value == "")
return true;
else
return false;}
</script>
function Validate()
{
if(document.forms[0].name.value == "")
return true;
else
return false;}
</script>
b.
<script type="text/javascript">
function Validate()
{
if(document.forms[0].name.value == "")
return false;
else
return true;
}
</script>
function Validate()
{
if(document.forms[0].name.value == "")
return false;
else
return true;
}
</script>
c.
<script type="text/javascript">
function Validate()
{
if(document.forms[0].name== "")
return false;
else
return true;
}
</script>
function Validate()
{
if(document.forms[0].name== "")
return false;
else
return true;
}
</script>
d.
<script type="text/javascript">
function Validate()
{
if(document.forms[0].name == "")
return true;
else
return false;
}
</script>
function Validate()
{
if(document.forms[0].name == "")
return true;
else
return false;
}
</script>
Which
of the following is the correct way to create an XML object in E4X?
a.
var languages = new XML('<languages
type="dynamic"><lang>JavaScript</lang><lang>Python</lang></languages>');
b.
var languages XML = new XML('<languages
type="dynamic"><lang>JavaScript</lang><lang>Python</lang></languages>');
c.
var languages = <languages type="dynamic">
<lang>JavaScript</lang>
<lang>Python</lang>
</languages>;
<lang>JavaScript</lang>
<lang>Python</lang>
</languages>;
d.
All of the above are correct.
e.
a and c
f.
b and c
What
does the following JavaScript code do? <head id="Head1"
runat="server">
<title></title>
<script type="text/javascript">
function validate() {
var chk = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
var ok = "yes";
var temp;
var field1 = document.getElementById("t1");
var field = field1.value.substring(field1.value.length - 1, field1.value.length);
if (chk.indexOf(field) == "-1") {
alert("error");
field1.value = (field1.value).slice(0, field1.value.length - 1);
}
}
</script>
</head>
<body>
<form id="form1" runat="server">
<input type="text" id="t1" onkeyup="validate()" onkeypress ="validate()"/>
</form>
</body>
<script type="text/javascript">
function validate() {
var chk = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
var ok = "yes";
var temp;
var field1 = document.getElementById("t1");
var field = field1.value.substring(field1.value.length - 1, field1.value.length);
if (chk.indexOf(field) == "-1") {
alert("error");
field1.value = (field1.value).slice(0, field1.value.length - 1);
}
}
</script>
</head>
<body>
<form id="form1" runat="server">
<input type="text" id="t1" onkeyup="validate()" onkeypress ="validate()"/>
</form>
</body>
a.
The code will cause an error alert to be displayed if a non alphabet
character is entered.
b.
The code will cause an error alert to be displayed if ALPHABET
character is entered.
c.
The code will cause NO error alert to be displayed if a numeric
character is entered.
d.
The code will cause NO error alert to be displayed if a NON ALPHABET
character is entered.
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