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. Math object method used to return the absolute value of a given number
toUpperCase()
var arrayVar = new Array()
document.getElementById("checkboxId").checked;
Math.abs(number)

2. The four attributes of the <script> tag:Type - Src - _____ and Defer
document.getElementById("spanId").firstChild;
Objects
sensitive
Charset

3. Date object method used to return a string containing the time
toTimeString()
var stringVar = prompt("Text Here")
substring(startIndex)
Underscores

4. When you __________ a javascript variable it retains its original value
setMilliseconds()
var stringVar = "part 1:" + "part 2";
toUpperCase()
redeclare

5. To display a confirmation
var dateObject = new Date(year, month, day, hours, minutes, seconds, milliseconds)
toString()
document.getElementById("CheckboxId").checked = true; //Could also be false
confirm("Message Text Here")

6. To set focus on the control for textboxes
redeclare
document.getElementById("TextBoxId").focus;
confirm()
charAt(position)

7. To get the current value of the control for a text area
ondblclick
document.getElementById("textAreaId").value;
Multi line
var dateObject = new Date(year, month, day, hours, minutes, seconds, milliseconds)

8. The identity operator for not equal
global
f
!==
"

9. String object method used to return a new string that contains part of the original string from the specified start position and up to but not including the specified stop index
v
substring(startIndex, stopIndex)
ondblclick
var dateObject = new Date("11/22/2012 18:25:35")

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

11. Number object method used to return a numerical string with the specified number of significant digits
window.location = "New Web Address Here";
toPrecision(precision)
Number.NEGATIVE_INFINITY
var answerVar = confirm("Message Text Here")

12. To set the control to be disabled for textboxes
document.getElementById("radioButtonId").value;
global
document.getElementById("CheckboxId").checked = true; //Could also be false
document.getElementById("TextBoxId").disabled = true;

13. To create a new Date object
Either single or double quotes surrounding the data
var dateObject = new Date(year, month, day, hours, minutes, seconds, milliseconds)
window.onload = function() {//actions here}
setMilliseconds()

14. To test that a variable contains a valid number
semicolon ";"
document.getElementById("TextBoxId").value;
document.getElementById(id)
isNaN(varHere) //Returns true or false.

15. The string escape sequence to insert a vertical tab in JavaScript
v
===
charAt(position)
while (condition) {}

16. To alter the value of the text element in a span tag
document.getElementById("spanId").firstChild;
document.getElementById(id)
\
document.getElementById("spanId").firstChild.nodeValue = "New Value";

17. What String object method returns a new string containing the value of the original string but in all lower case
\
while (condition) {}
toLowerCase()
var stringVar = prompt("Text Here")

18. A statement that yields a value
document.getElementById("checkboxId").value;
document.getElementById("textAreaId").value;
===
expression

19. To set the current checked status of the control for radio buttons
while (condition) {}
udddd
alert("Alert Text Here")
document.getElementById("radioButtonId").checked = true; //Could also be false

20. To create a Date object in JavaScript
charAt(position)
var dateVar = new Date()
string
Math.min(var1, var2, varN)

21. What String object method returns a new string containing the value of the original string but in all upper case
standard equality operators
toUpperCase()
toLowerCase()
window.location()

22. To display an alert
var dateObject = new Date(year, month, day, hours, minutes, seconds, milliseconds)
alert("Alert Text Here")
document.getElementById("TextBoxId").disabled = true;
var dateObject = new Date("11/22/2012 18:25:35")

23. Math object method used to return a given number rounded to the next highest integer value
document.getElementById("checkboxId").checked;
window.location = "New Web Address Here";
Math.ceil(number)
document.getElementById("radioButtonId").checked;

24. To assign the return value of confirm() to a variable
document.writeln("Text Here") //Advances to new line after text
var answerVar = confirm("Message Text Here")
redeclare
Use a parse. Example : var intVar = parseInt(prompt("Text Here"))

25. The string escape sequence to insert a tab in JavaScript
document.getElementById("ButtonId").onclick = functionName;
t
redeclare
toDateString()

26. The available set methods for a Date object: setFullYear() - setMonth() - setDate() - setHours() - setMinutes() - setSeconds() - _________
Charset
'
toDateString()
setMilliseconds()

27. The _____ attribute is used to denote external file for script use
var dateObject = new Date("11/22/2012 18:25:35")
ondblclick
Src - e.g. <script src="fileName.js"> //
<script type="text/javascript">.....</script>

28. The available properties for the Number object: Number.MAX_VALUE - Number.MIN_VALUE - Number.POSITIVE_INFINITY - _______ - Number.NaN
window.location = "New Web Address Here";
document.getElementById("spanId").firstChild;
Underscores
Number.NEGATIVE_INFINITY

29. The string escape sequence to insert a form feed in JavaScript
toExponential(digits)
f
document.getElementById("listId").value;
v

30. The ________ tag is used to display the text between the opening and closing tag if JavaScript is disabled or otherwise not available
var stringVar = prompt("Text Here")
toPrecision(precision)
window.location()
<noscript>

31. String object method used to get the character at a specified index position
charAt(position)
'
substring(startIndex)
"

32. Date object method used to return a string containing the date
getFullYear()
toDateString()
document.getElementById("radioButtonId").checked;
toTimeString()

33. The format to create a new Date object from a string
var dateObject = new Date("11/22/2012 18:25:35")
redeclare
document.getElementById(id)
===

34. The syntax of a conditional operator
sensitive
(Condition_Expression) ? Value_If_True : Value_If_False;
var dateVar = new Date()
confirm()

35. To create an Array object in JavaScript
string
Math.min(var1, var2, varN)
var arrayVar = new Array()
getTime()

36. To assign the value from a prompt to a non-string variable
document.getElementById("ButtonId").onclick = functionName;
toFixed(digitCount)
Math.ceil(number)
Use a parse. Example : var intVar = parseInt(prompt("Text Here"))

37. To get the text value of the control for radio buttons
document.getElementById("checkboxId").value;
Math.pow(number, power)
expression
Objects

38. Number object method used to return a string with a given number base
getFullYear()
toString(base)
expression
isNaN(varHere) //Returns true or false.

39. Unlike ________________ identity operators do not perform type coercion.
var answerVar = confirm("Message Text Here")
document.getElementById("spanId").firstChild.nodeValue = "New Value";
standard equality operators
"

40. To denote a string in JavaScript
if (condition) {}
Either single or double quotes surrounding the data
document.getElementById("TextBoxId").value;
toUpperCase()

41. The string escape sequence to insert a carriage return in JavaScript
confirm()
toExponential(digits)
concat(var1, var2, varN)
r

42. Number object method used to round numbers to the specified number of decimal places
Either single or double quotes surrounding the data
!==
<script type="text/javascript">.....</script>
toFixed(digits)

43. Number object method used to return a number in exponential format with the specified number of decimal places
toExponential(digits)
document.getElementById(id)
toFixed(digits)
document.getElementById("textAreaId").value = "Text Value";

44. To write text to the current element of the DOM
Either single or double quotes surrounding the data
isNaN(varHere) //Returns true or false.
document.write("Text Here") //Remains on current line
indexOf(searchValue, startPosition)

45. Math object method used to return a given number that has been rounded to the closes integer value
Math.round(number)
Use the second parameter. Example: prompt("Enter Age:", "18")
focus
indexOf(searchValue, startPosition)

46. To assign the value from a prompt to a string
Math.ceil(number)
toFixed(digitCount)
expression
var stringVar = prompt("Text Here")

47. The valid characters for an identifier in JavaScript: Letters - Numbers - ________ and Dollar Signs
window.location()
document.getElementById("CheckboxId").checked = true; //Could also be false
var functionName = function(param1, param2, paramN) {}
Underscores

48. To code a while statement in JavaScript
document.getElementById("textAreaId").value = "Text Value";
while (condition) {}
document.getElementById("checkboxId").checked;
<script type="text/javascript">.....</script>

49. A list-like construct that has properties which corresponds to JavaScript values or variables or other objects.
r
Objects
substring(startIndex)
var stringVar = "part 1:" + "part 2";

50. The string escape sequence to insert a backslash in JavaScript
<noscript>
confirm()
Math.round(number)
\