Knowledge of Prototype Skills Test Answers
·
1. Which of the following ways can you
use to check whether prototype is loaded or not?
Answers:
•
typeof(Prototype) === "object"
•
typeof(Prototype) == "String"
•
typeof(Prototype) == "function"
• There is no way
to do that.
2. Consider the following code
snippet:
Sortable.create("id1");
Assume that nodes which id: id11, id12
are children of id1 and nodes which id: id111, id112 are children of id11.
Which of the following elements can be sortable?
Answers:
• id11 and id12
• id111 and id112
• all
• none
3. Which of the following statements displays
prototype version of Prototype?
Answers:
•
Prototype.Version
• $.Version
•
VersionOf("Prototype")
• VersionOf($);
4. Which of the given options is the
result of the following code snippet?
new Builder.node("div",
{className: "error"}, "Error");
Answers:
• Change
innerHTML of div tags that have "error" class to Error.
• Change class of
div tags that contain "Error" to "error".
• Create a div
tag that has "error" as class name and contains "Error"
text.
• This code
snippet is invalid.
5. Which of the following parameters
is/are valid parameter(s) of Effect.Highlight() method?
Answers:
• startColor
• end-color
• restorecolor
• border-color
6. What is the result of
"thisisprototype".camelize(); statement?
Answers:
• thisisprototype
• thisIsPrototype
• ThisIsPrototype
• THISISPROTOTYPE
7. What is the valid range of $R(1,
10, true);?
Answers:
• 1 to 9
• 1 to 10
• 2 to 9
• 2 to 10
8. What is the result of the following
code snippet?
el.insert("«span»Prototype«/span»");
Answers:
•
«span«Prototype«/span« will be the last child of el.
•
«span«Prototype«/span« will be the first child of el.
•
«span«Prototype«/span« will replace innerHTML of el.
• This code
snippet is invalid.
9. Consider the following code
snippet:
new Effect.Scale("id1",
arg2);
Which attribute(s) is id1 element
scaled to?
Answers:
• width
• height
• font
• border
10. What is the value of $A($R('ab',
'ah'));?
Answers:
•
["ab", "ac", "ad", "ae",
"af", "ag", "ah"]
•
["ac", "ad", "ae", "af",
"ag"]
• ["ab",
"ac", "ad", "ae", "af", "ag"]
• This statement
is invalid.
11. Which of the following options
is/are valid element(s) of the function-
Form.Element.present(element);
Answers:
• input
• textarea
• button
• This function
is invalid.
12. Which of the given values can be
the value of arg in the following code snippet?
$("id1").insert(arg);
Answers:
•
"<span>Prototype</span>"
•
$("id2");
• new
Element("span", "Prototype");
13. Consider the following code
snippet:
var a = {framework:
"Prototype", version: "1.6.1"};
var b = a.toObject();
alert(b.version);
What does the alert box display?
Answers:
• 1.6.1
• null
• undefined
• This code
snippet causes an error.
14. What is the result of b in the
following code snippet?
var a = {name: "Prototype",
version: "1.6.1"}
var b = Object.values(a);
Answers:
•
["Prototype", "1.6.1"]
• {name:
"Prototype", version: "1.6.1"}
• [[name,
"Prototype"], [version, "1.6.1"]]
• [{name:
"Prototype"}, {version: "1.6.1"}]
15. Consider the following code
snippet:
new Effect.Scale(agr1, arg2);
What is arg2 parameter?
Answers:
• Percentage to
scale
• Number of times
to scale
• Width
• Height
16. Which of the following tags can
make element draggable?
Answers:
• p
• span
• div
• li
17. Which of the following methods can
you use to fade in an element?
Answers:
•
Effect.FadeIn();
• Effect.Fade();
• Effect.Show();
•
Effect.Appear();
18. You ___ create instances of
Ajax.Response yourself.
Answers:
• do not need to
• have to
• can not
• are not allowed
to
19. Which of the following methods
allows you to set many style attributes in one call?
Answers:
• setStyle
• setStyles
• setAttribute
• setAttributes
20. Which of the following objects
allows you to monitor Ajax activities?
Answers:
• Ajax.Responders
• Ajax.Monitor
• Ajax.Response
• There are no
such objects.
21. You have a local autocomplete like
the following:
new Autocompleter.Local(arg1, arg2,
arg3, arg4);
Assume that you want to create a local
autocomplete text field. You want to display all possible values on div1 div
element and show this div to the user. Which of the following arguments is the
value of div1 div?
Answers:
• arg1
• arg2
• arg3
• arg4
22. What is the result of the
following code snippet?
[1, 2, 3, 4, 5].map( function(num) {
return num * num; } );
Answers:
• [1, 4, 9, 16,
25]
• 55
• 25
• This code
snippet causes an error.
23. Consider the following code
snippet:
var Animal = Class.create({initialize:
function(wildOrNot, canFly) {this.wildOrNot = WildOrNot; this.canFly =
canfly;}});
var Wolf = Class.create(Animal,
{initialize: function($super, arg2) {$super("Wild", false);
this.leatherColor = arg2}});
Which of the following is the proper
way to create a Wolf object?
Answers:
• var aWolf = new
Wolf("Yellow");
• var aWolf = new
Wolf("Wild", false, "Yellow");
• var aWolf = new
Wolf($super, "Yellow");
• var aWolf = new
Wolf(Animal, "Yellow");
24. What is the result of the
following code snippet?
[1, null, 2, false, 3].partition();
Answers:
• [[1, 2, 3],
[null, false]]
• [1, 2, 3, null,
false]
• [1, 2, 3]
• [null, false,
1, 2, 3]
25. What is the value of b in the
following code snippet?
var a = ["this",
"is", "prototype"];
var b = a.inject(0, function(c, d) {
return c + d.length;
});
Answers:
• 15
• 9
• 150
• This code
snippet is invalid.
26. What is the result of
10.toColorPart(); statement?
Answers:
• 0a
• 10
• 1010
• This statement causes
an error.
27. Which of the following statements
is valid?
Answers:
•
Object.isUndefined(a);
•
a.isUndefined();
• isUndefined(a);
• isDefined(a);
28. Which of the following properties
holds the number of active requests?
Answers:
•
Ajax.activeRequestCount
•
Ajax.numberActiveRequests
•
Ajax.activeRequests
• There are no
such properties.
29. What is the result of the
following function?
function a() {
var x = 10;
return x.toPaddedString(4);
}
Answers:
• 0010
• 000a
• 10.00
• This function
is invalid.
30. What is the result of "this
is".include("prototype"); statement?
Answers:
• this is
prototype
• prototype this
is
• true
• false
31. What is the result of the
following code snippet?
[1, 2, 3, 4, 5].detect(function(n)
{return n % 3});
Answers:
• 1
• 2
• 3
• 5
32. Consider the following code
snippet:
var s = '';
(5).times(function(n) {
s += n;
});
alert(s);
What does the alert box display?
Answers:
• 01234
• 55555
• 10
• Nothing
33. Which of the following form's
functions allows you to submit a form using Ajax?
Answers:
• request
• call
• get
• post
34. What does the following statement
return?
fom1.findFirstElement();
Answers:
• The first
non-hidden, non-disabled control of form1 form.
• The first
control of form1 form.
• The first
hidden control of form1 form.
• This statement
is invalid.
35. Which of the following code
snippets is the proper way to define a class in prototype?
Answers:
• var Point =
Class.create({initialize: function(x, y) {this.x = x; this.y = y;}});
• var Point =
function(x, y) {this.x = x; this.y = y;}
• var Point =
Class({Point: function(x, y) {this.x = x; this.y = y;}});
• class Point
{function Point(x, y) {this.x = x; this.y = y;}};
36. The number of arguments of
Try.these() are ___.
Answers:
• 2
• 4
• 6
• infinite
37. Consider the following code
snippet:
Element.addMethods({
: show: function(element) {
: alert("This is prototype.");
}
});
What does this code snippet do?
Answers:
• It adds show
method to all elements.
• It adds show method
to "element" element.
• This code
snippet is invaid.
38. Which of the following functions
allows/allow you to register an event to an element?
Answers:
• Event.observe
• Element.observe
• Event.register
•
Element.register
39. Which of the following functions
is used to call the initialize method of the parent class?
Answers:
• $super
• initialize
• Method has the
same name as parent class name.
• It is not
possible to call the initialize method of the parent class.
40. Which of the following methods allows
you to add a new instance of method to a class after that class has been
defined?
Answers:
• initialize
• constructor
• Method has the
same name as class name.
• There is no
constructor of prototype class.
41. If the server response time is
slow, you may consider increasing the ___ option parameter to reduce the
response time.
Answers:
• frequency
• wait
• interval
42. How can you stop an event from
propagating?
Answers:
• Event.stop
•
Event.preventDefault
•
Event.stopPropagation
• Event.preventPropagation
43. If you want to make an Ajax
request using xml instead of the regular URL-encoded format, which option
parameter do you have to change?
Answers:
• contentType
• method
• encoding
• It is not
possible to send request using xml.
44. What does identify method of
element do?
Answers:
• It returns
element's ID. If element does not have an ID, one is generated, assigned to
element, and returned..
• It returns the
id of that element.
• It generates an
id for that element.
• This method
does not exist.
45. Which of the following is the
result of "this_is_prototype".dasherize(); statement?
Answers:
•
this-is-prototype
• thisisprototype
• ThisIsPrototype
• this is
prototype
46. What does cleanWhiteSpace method
of element do?
Answers:
• It removes all
of element's child text nodes that contain only whitespace.
• It removes
whitespace from element.
• It removes
whitespace from the content of all child nodes.
• This method
does not exist.
47. Which of the following methods
allows you to add class to a class after that class is defined?
Answers:
•
Class.addMethods
•
Class.includeMethods
• Class.add
• Class.include
48. The callback function in options
of Ajax.Autocomplete() is called ___ the request is actually made.
Answers:
• before
• after
49. How can you add class to id1
element?
Answers:
•
id1.addClass("className");
•
id1.addClassName("className");
•
$("id1").add("className");
•
$("id1").setClassName("className");
50. Elements and ids can be
interchangeable in function calls, if a function expects a document id.
Answers:
• True
• False
51. What does the following statement
do?
new Ajax.Updater("el1",
"/index");
Answers:
• It updates
element that has "el1" id with the content response from /index page.
• It updates
elements that have "el1" class with the content response from /index
page.
• It updates
"el1" element content with "/index" .
• This statement
is invalid.
52. Which of the following functions
returns the element that occurred?
Answers:
• Event.element
• Event.target
• Element.target
•
Element.eventTarget
53. Which of the following is/are a
valid callback of core effects?
Answers:
• beforeStart
• afterSetup
• beforeUpdate
• afterFinish
54. PeriodicalUpdater updates an
element ___.
Answers:
• at the given
frequency.
• with the
specified number of times.
• at the given
hours.
• This function
does not exist.
55. Which of the following code
snippets is the proper way to define a class that inherits another class?
Answers:
• var Dog = Class.create(Animal,
{});
• var Dog =
Class.inherit(Animal, {});
• var Dog =
Class.extend(Animal, {});
• var Dog =
Animal.extend({});
56. Which of the following functions
updates an existing hash?
Answers:
• update
• merge
• delete
• remove
57. What does match method of element
do?
Answers:
• It checks
whether this element matches the given css selector.
• It checks
whether this element matches the given id selector.
• It checks
whether this element matches the given css or id selector.
• This method
does not exist.
58. The time to complete an effect
generally depends on the speed of the computer.
Answers:
• True
• False
59.
$("id1").wrap("div", {"class" :
"container"});
Answers:
• This code
snippet will wrap id1 in a div tag.
• This code snippet
will wrap div tags that have "container" class in id1 element.
• This code
snippet is invalid.
60. What is the difference between the
names of native browser events and prototype custom events?
Answers:
• Custom events
have a colon (:) in their name.
• Native browser
events have a colon (:) in their name.
• Native browser
event names are case-sensitive.
• There are no
differences.
61. When is the Ddom:loaded event
fired?
Answers:
• Before the DOM
tree is loaded.
• After the DOM
tree is loaded, before window's load event.
• After load
event.
• After an Ajax
request finishes.
62. Which of the following element
methods finds siblings of that element?
Answers:
• sibling
• adjacent
• children
• There is no
such method.
63. Which of the following code
snippets changes properties of element's css?
Answers:
•
$('id1').morph("height: 200; width: 200;");
•
$('id1').morph("height: 200", "width: 200");
•
$('id1').morph("height: 200").morph( "width: 200");
•
$('id1').morph({"height" =» "200", "width" =»
"200");
64. ___ extends event with all of the
methods contained in Event.Methods.
Answers:
• Event.extend
• Event.include
• Event.inherit
• There is no
method to do so.
65. Which of the following effects are
core effects?
Answers:
• Effect.Appear
• Effect.Opacity
• Effect.Tween
• Effect.Move
66. Which of the following functions
converts html special characters to their entity equivalents?
Answers:
• escapeHTML
• escape
• removeHTML
• convertHTML
67. Consider the following code
snippet:
1 $('id1').observe("click",
function() {
2 new
Effect.Highlight("id1", {startcolor: '#ff9999', endcolor:
'#ffffff'});
3 return false;
4 });
If you click it once, then click it
one more time while the it's highlighted, its highlighted color looks strange.
Which of the following ways may fix that problem?
Answers:
• Change the
second line to: new Effect.Highlight("id1", {startcolor: '#ff9999', endcolor:
'#ffffff', queue: 'end'});
• Change return
false; to return true;
• Change the
first line to $('id1').observe("doubleclick", function() {
68. What does $F(element).getValue()
return?
Answers:
• It returns the
current value of a form control.
• It returns the
value of function $F.
• It returns the
value of any given element.
• This function
is invalid.
69. What will be returned if
Event.findElement("click", "div"); cannot find any elements
that match the specified tag?
Answers:
• document
• null
• undefined
• The element
that has registered click event handler.
70. Consider the following code
snippet:
var template = new Template("This
is #{framework} version #{version}");
var a = {framework:
"Prototype", version: "1.6.1"}
var b = template.evaluate(a);
What is the result of b?
Answers:
• This is
Prototype version 1.6.1
• This is
#{framework} version #{version}
• This is 1.6.1
version Prototype
• This code
snippet is invalid.
71. Consider the following code
snippet:
new Ajax.InPlaceEditor("id1",
"save.jsp");
What is the request parameter name of
id1 element on server When its value changes?
Answers:
• id1
• InPlaceEditor
• value
• This code
snippet is incorrect.
72. Function.bind(object); will
replace ___ variable in function by "object".
Answers:
• this
• document
• window
• function
73. __________ allows more than one
effects to occur at the same time.
Answers:
• Effect.Parallel
•
Effect.Asynchronous
• Effect.run
• There is no
such method.
74. What does the statement $('item1',
'item2', 'item3'); return?
Answers:
• A collection of
elements with item1, item2, item3 ids.
• A collection of
elements that have one of the item1, item2, item3 classes.
• This statement
is invalid.
75. Which of the following methods
allows you to set element attributes?
Answers:
• setAttribute
• setAttributes
• writeAttribute
• writeAttributes
76. Which of the following code
snippets moves id1 element?
Answers:
• new
Effect.Move("id1", {0, 0, 'relative'});
•
"id1".Move("x: 0; y: 0");
•
"id1".Move(x: 0, y: 0, "left");
• new
Effect.Move("id1", {x: 0, y: 0});
77. The difference between
Effect.SlideUp and Effect.BlindUp is that ___.
Answers:
• Effect.BlindUp
hides element from the bottom first, whereas Effect.SlideUp hides element from
the top first.
• Effect.SlideUp
moves the element up, whereas Effect.BlindUp hides the element.
• Effect.BlindUp
removes the element, whereas Effect.SlideUp hides the element.
• There is no
difference.
78. Which of the following functions
fires a custom event?
Answers:
• Event.fire
• Event.execute
• Event.run
• There is no
such method.
