Test your basic knowledge |

Javascript Basics

Subject : it-skills

Instructions:

Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can study here.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. String object method used to concatenate multiple strings
concat(var1, var2, varN)
var dateObject = new Date("11/22/2012 18:25:35")
document.getElementById("listId").value;
Math.pow(number, power)

2. Math object method used to return a given number rounded to the next highest integer value
Math.round(number)
substring(startIndex, stopIndex)
Multi line
Math.ceil(number)

3. Math object method used to return a given number raised to a given power
Either single or double quotes surrounding the data
Math.round(number)
Math.pow(number, power)
Charset

4. To view the current web address using JavaScript
var dateVar = new Date()
substring(startIndex, stopIndex)
'
window.location()

5. To write a line to the current element of the DOM (Document Object Model)
'
document.writeln("Text Here") //Advances to new line after text
document.getElementById("TextBoxId").value;
alert("Alert Text Here")

6. A _______ variable can be changed and accessed from within and without a function or object.
global
document.getElementById("spanId").firstChild.nodeValue = "New Value";
document.getElementById("textAreaId").value;
var dateObject = new Date("11/22/2012 18:25:35")

7. To create a function in JavaScript
substring(startIndex)
var functionName = function(param1, param2, paramN) {}
expression
toPrecision(precision)

8. Math object method used to return the square root of a given number
var dateObject = new Date("11/22/2012 18:25:35")
document.getElementById("radioButtonId").value;
Math.sqrt(number)
confirm()

9. To get the text value of the control for radio buttons
document.getElementById("radioButtonId").value;
document.write("Text Here") //Remains on current line
if (condition) {}
getFullYear()

10. Unlike ________________ identity operators do not perform type coercion.
for (counter; condition; incrementor) {}
standard equality operators
var variableName;
expression

11. To get the current checked status of the control for radio buttons
document.getElementById("TextBoxId").focus;
document.getElementById("spanId").firstChild.nodeValue = "New Value";
\
document.getElementById("radioButtonId").checked;

12. When you __________ a javascript variable it retains its original value
alert("Alert Text Here")
document.getElementById("radioButtonId").checked;
Either single or double quotes surrounding the data
redeclare

13. The four attributes of the <script> tag:Type - Src - _____ and Defer
Charset
var dateObject = new Date(year, month, day, hours, minutes, seconds, milliseconds)
substring(startIndex, stopIndex)
getTime()

14. The string escape sequence to start a new line in JavaScript
confirm()
toExponential(digits)
getTime()
n

15. The identity operator for equals
===
sensitive
r
"

16. The valid characters for an identifier in JavaScript: Letters - Numbers - ________ and Dollar Signs
toExponential(digits)
concat(var1, var2, varN)
Underscores
var functionName = function(param1, param2, paramN) {}

17. The string escape sequence to insert a carriage return in JavaScript
n
toFixed(digits)
concat(var1, var2, varN)
r

18. To create a new Date object
var dateObject = new Date(year, month, day, hours, minutes, seconds, milliseconds)
toTimeString()
var stringVar = prompt("Text Here")
getFullYear()

19. Date object method used to return a string containing the date and time
getFullYear()
toString()
var functionName = function(param1, param2, paramN) {}
var dateObject = new Date("11/22/2012 18:25:35")

20. To insert Javascript into a web page
document.writeln("Text Here") //Advances to new line after text
document.getElementById("textAreaId").value;
<script type="text/javascript">.....</script>
Math.ceil(number)

21. To get the text value of the control for radio buttons
toFixed(digitCount)
document.getElementById("checkboxId").value;
Src - e.g. <script src="fileName.js"> //
document.getElementById("TextBoxId").value;

22. The two methods common to most controls: ______ //Brings focus to the control blur //Removes focus from the control
var dateObject = new Date(year, month, day, hours, minutes, seconds, milliseconds)
document.getElementById("checkboxId").checked;
getTime()
focus

23. To set focus on the control for textboxes
document.getElementById("TextBoxId").focus;
var stringVar = "part 1:" + "part 2";
standard equality operators
global

24. To create a function that returns a value in JavaScript
var functionName = function(param1, param2, paramN) {}
<script type="text/javascript">.....</script>
Objects
toPrecision(precision)

25. ________ comments start with / and end with /.
f
substring(startIndex, stopIndex)
document.getElementById("textAreaId").value;
Multi line

26. A list-like construct that has properties which corresponds to JavaScript values or variables or other objects.
Charset
Objects
document.getElementById("spanId").firstChild.nodeValue = "New Value";
Math.abs(number)

27. The string escape sequence to insert a backslash in JavaScript
document.write("Text Here") //Remains on current line
\
confirm("Message Text Here")
standard equality operators

28. To access the text element in a <span> tag
document.getElementById("spanId").firstChild;
Src - e.g. <script src="fileName.js"> //
string
<script type="text/javascript">.....</script>

29. To set the current value of the control for a text area
var functionName = function(param1, param2, paramN) {}
document.getElementById("textAreaId").value = "Text Value";
toLowerCase()
Math.floor(number)

30. What Date object method is used to return the number of milliseconds since the start of GMT
var answerVar = confirm("Message Text Here")
isNaN(varHere) //Returns true or false.
getTime()
document.getElementById("spanId").firstChild;

31. To assign actions to the window onLoad event
string
var stringVar = "part 1:" + "part 2";
var arrayVar = new Array()
window.onload = function() {//actions here}

32. When you add a string and a number the result will be a ____
document.getElementById("checkboxId").value;
window.location = "New Web Address Here";
isNaN(varHere) //Returns true or false.
string

33. The available set methods for a Date object: setFullYear() - setMonth() - setDate() - setHours() - setMinutes() - setSeconds() - _________
setMilliseconds()
document.getElementById("checkboxId").value;
var stringVar = "part 1:" + "part 2";
substring(startIndex, stopIndex)

34. Math object method used to return a random number
Multi line
document.writeln("Text Here") //Advances to new line after text
Math.random() //Returns a value >= 0.0 but <1.0
Either single or double quotes surrounding the data

35. To test that a variable contains a valid number
v
(Condition_Expression) ? Value_If_True : Value_If_False;
var answerVar = confirm("Message Text Here")
isNaN(varHere) //Returns true or false.

36. To get the current value of the control for a text area
var arrayVar = new Array()
Number.NEGATIVE_INFINITY
document.getElementById("textAreaId").value;
f

37. Math object method used to return the highest value from a set of supplied numbers
document.getElementById("TextBoxId").value;
n
Math.max(var1, var2, varN)
v

38. To code a button.onclick event handler
for (counter; condition; incrementor) {}
document.getElementById("ButtonId").onclick = functionName;
if (condition) {}
while (condition) {}

39. To display an alert
isNaN(varHere) //Returns true or false.
alert("Alert Text Here")
standard equality operators
toString(base)

40. What String object method returns a new string containing the value of the original string but in all lower case
toLowerCase()
document.getElementById("TextBoxId").disabled = true;
event handler .
toString(base)

41. The string escape sequence to insert a double quote in JavaScript
document.getElementById("TextBoxId").disabled = true;
var functionName = function(param1, param2, paramN) {}
Math.random() //Returns a value >= 0.0 but <1.0
"

42. To code an If statement in JavaScript
if (condition) {}
document.getElementById("checkboxId").value;
document.getElementById("TextBoxId").disabled = true;
'

43. To assign the value from a prompt to a string
toUpperCase()
toFixed(digits)
concat(var1, var2, varN)
var stringVar = prompt("Text Here")

44. The identity operator for not equal
expression
document.getElementById(id)
toFixed(digits)
!==

45. The format to create a new Date object from a string
Math.max(var1, var2, varN)
indexOf(searchValue, startPosition)
prompt("Text Here")
var dateObject = new Date("11/22/2012 18:25:35")

46. The escape sequence used to insert a Unicode character into a string in JavaScript
for (counter; condition; incrementor) {}
document.getElementById(id)
confirm("Message Text Here")
udddd

47. The syntax of a conditional operator
(Condition_Expression) ? Value_If_True : Value_If_False;
document.getElementById("checkboxId").checked;
window.onload = function() {//actions here}
document.getElementById("ButtonId").onclick = functionName;

48. To assign the return value of confirm() to a variable
indexOf(searchValue, startPosition)
document.getElementById("textAreaId").value;
getFullYear()
var answerVar = confirm("Message Text Here")

49. To display a confirmation
Charset
<noscript>
confirm("Message Text Here")
document.getElementById("textAreaId").value;

50. To concatenate multiple parts into a string
substring(startIndex)
var stringVar = "part 1:" + "part 2";
toUpperCase()
Use the second parameter. Example: prompt("Enter Age:", "18")