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. The string escape sequence to insert a tab in JavaScript
===
charAt(position)
t
<noscript>

2. To declare a variable in JavaScript
var answerVar = confirm("Message Text Here")
getTime()
var variableName;
ondblclick

3. To get the current value for textboxes
var functionName = function(param1, param2, paramN) {}
document.getElementById("TextBoxId").value;
<script type="text/javascript">.....</script>
document.getElementById("radioButtonId").checked = true; //Could also be false

4. The escape sequence used to insert a Unicode character into a string in JavaScript
Math.abs(number)
event handler .
sensitive
udddd

5. What String object method returns a new string containing the value of the original string but in all upper case
toUpperCase()
sensitive
toTimeString()
Underscores

6. The four attributes of the <script> tag:Type - Src - _____ and Defer
v
Math.min(var1, var2, varN)
var arrayVar = new Array()
Charset

7. The string escape sequence to insert a vertical tab in JavaScript
v
var stringVar = "part 1:" + "part 2";
substring(startIndex)
toString(base)

8. Date object method used to return a string containing the time
toTimeString()
<noscript>
redeclare
var stringVar = "part 1:" + "part 2";

9. To get the value or the currently selected item for lists
document.getElementById("listId").value;
Either single or double quotes surrounding the data
ondblclick
window.location = "New Web Address Here";

10. To set the digit precision of a decimal number
document.getElementById("CheckboxId").checked = true; //Could also be false
toFixed(digitCount)
var arrayVar = new Array()
charAt(position)

11. Math object method used to return a given number raised to a given power
document.getElementById("listId").value;
substring(startIndex, stopIndex)
Math.pow(number, power)
var stringVar = prompt("Text Here")

12. To create a Date object in JavaScript
var dateVar = new Date()
Math.random() //Returns a value >= 0.0 but <1.0
window.onload = function() {//actions here}
toTimeString()

13. To concatenate multiple parts into a string
r
var stringVar = "part 1:" + "part 2";
udddd
toTimeString()

14. To insert Javascript into a web page
<script type="text/javascript">.....</script>
"
confirm("Message Text Here")
window.location()

15. When you add a string and a number the result will be a ____
string
global
var answerVar = confirm("Message Text Here")
v

16. JavaScript is case _______
sensitive
confirm()
document.getElementById("CheckboxId").checked = true; //Could also be false
'

17. To access the text element in a <span> tag
redeclare
var functionName = function(param1, param2, paramN) {}
Underscores
document.getElementById("spanId").firstChild;

18. To create a new Date object
Math.sqrt(number)
!==
var dateObject = new Date(year, month, day, hours, minutes, seconds, milliseconds)
(Condition_Expression) ? Value_If_True : Value_If_False;

19. Math object method used to return the absolute value of a given number
indexOf(searchValue, startPosition)
\
Math.abs(number)
Two forward slashes "//"

20. A list-like construct that has properties which corresponds to JavaScript values or variables or other objects.
event handler .
ondblclick
Objects
udddd

21. Unlike ________________ identity operators do not perform type coercion.
standard equality operators
window.onload = function() {//actions here}
===
toFixed(digitCount)

22. The string escape sequence to insert a backslash in JavaScript
Math.random() //Returns a value >= 0.0 but <1.0
\
semicolon ";"
Math.round(number)

23. A function that is called with a certain event occurs - e.g. button.onclick and window.onload.
event handler .
sensitive
Math.max(var1, var2, varN)
Math.ceil(number)

24. Math object method used to return a given number that has been rounded to the closes integer value
Math.round(number)
Underscores
confirm("Message Text Here")
Math.max(var1, var2, varN)

25. To assign the return value of confirm() to a variable
n
event handler .
document.getElementById(id)
var answerVar = confirm("Message Text Here")

26. The string escape sequence to insert a double quote in JavaScript
var stringVar = "part 1:" + "part 2";
substring(startIndex, stopIndex)
var arrayVar = new Array()
"

27. To create a single line comment in JavaScript
alert("Alert Text Here")
window.onload = function() {//actions here}
for (counter; condition; incrementor) {}
Two forward slashes "//"

28. To assign actions to the window onLoad event
setMilliseconds()
document.getElementById("listId").value;
window.onload = function() {//actions here}
n

29. To set the current value of the control for a text area
Math.floor(number)
redeclare
document.getElementById("textAreaId").value = "Text Value";
window.location()

30. To assign the value from a prompt to a string
var stringVar = prompt("Text Here")
document.getElementById("radioButtonId").checked = true; //Could also be false
toString()
toString(base)

31. To write text to the current element of the DOM
for (counter; condition; incrementor) {}
var dateObject = new Date(year, month, day, hours, minutes, seconds, milliseconds)
document.getElementById("radioButtonId").checked;
document.write("Text Here") //Remains on current line

32. A _______ variable can be changed and accessed from within and without a function or object.
global
document.getElementById("checkboxId").value;
var arrayVar = new Array()
document.getElementById(id)

33. The string escape sequence to start a new line in JavaScript
event handler .
n
confirm()
Math.random() //Returns a value >= 0.0 but <1.0

34. The string escape sequence to insert a form feed in JavaScript
f
Objects
var answerVar = confirm("Message Text Here")
Math.sqrt(number)

35. The valid characters for an identifier in JavaScript: Letters - Numbers - ________ and Dollar Signs
Underscores
while (condition) {}
<noscript>
var stringVar = "part 1:" + "part 2";

36. Statements end in JavaScript with a ________
semicolon ";"
document.getElementById("TextBoxId").disabled = true;
Either single or double quotes surrounding the data
var stringVar = prompt("Text Here")

37. The available properties for the Number object: Number.MAX_VALUE - Number.MIN_VALUE - Number.POSITIVE_INFINITY - _______ - Number.NaN
var functionName = function(param1, param2, paramN) {}
document.getElementById("TextBoxId").value;
Number.NEGATIVE_INFINITY
toTimeString()

38. To code a for statement in JavaScript
Charset
Src - e.g. <script src="fileName.js"> //
===
for (counter; condition; incrementor) {}

39. To set the current checked status of the control for checkboxes
semicolon ";"
'
var variableName;
document.getElementById("CheckboxId").checked = true; //Could also be false

40. String object method used to return the position of the first instance of a specified search string starting from the specified index
'
indexOf(searchValue, startPosition)
Objects
focus

41. To create an Array object in JavaScript
var arrayVar = new Array()
var functionName = function(param1, param2, paramN) {}
var dateObject = new Date("11/22/2012 18:25:35")
prompt("Text Here")

42. The _____ attribute is used to denote external file for script use
Src - e.g. <script src="fileName.js"> //
Math.random() //Returns a value >= 0.0 but <1.0
document.getElementById("radioButtonId").checked = true; //Could also be false
document.getElementById("TextBoxId").value;

43. To assign the value from a prompt to a non-string variable
Use a parse. Example : var intVar = parseInt(prompt("Text Here"))
while (condition) {}
<script type="text/javascript">.....</script>
var dateObject = new Date(year, month, day, hours, minutes, seconds, milliseconds)

44. To alter the value of the text element in a span tag
Math.pow(number, power)
document.getElementById("spanId").firstChild;
document.getElementById("spanId").firstChild.nodeValue = "New Value";
toLowerCase()

45. The two methods common to most controls: ______ //Brings focus to the control blur //Removes focus from the control
Math.ceil(number)
focus
Use a parse. Example : var intVar = parseInt(prompt("Text Here"))
Math.max(var1, var2, varN)

46. This returns only True or false values
isNaN(varHere) //Returns true or false.
var dateVar = new Date()
window.location = "New Web Address Here";
confirm()

47. Number object method used to return a string with a given number base
var functionName = function(param1, param2, paramN) {}
Math.min(var1, var2, varN)
toString(base)
Number.NEGATIVE_INFINITY

48. ________ comments start with / and end with /.
redeclare
document.getElementById("ButtonId").onclick = functionName;
Multi line
var functionName = function(param1, param2, paramN) {}

49. 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
sensitive
"
Use the second parameter. Example: prompt("Enter Age:", "18")
substring(startIndex, stopIndex)

50. Number object method used to return a number in exponential format with the specified number of decimal places
toFixed(digits)
Math.ceil(number)
toExponential(digits)
Use a parse. Example : var intVar = parseInt(prompt("Text Here"))