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 single quote in JavaScript

2. The ________ tag is used to display the text between the opening and closing tag if JavaScript is disabled or otherwise not available
<noscript>
v
Math.sqrt(number)
<script type="text/javascript">.....</script>

3. Number object method used to round numbers to the specified number of decimal places
<script type="text/javascript">.....</script>
Src - e.g. <script src="fileName.js"> //
toFixed(digits)
Math.floor(number)

4. What String object method returns a new string containing the value of the original string but in all upper case
toLowerCase()
toUpperCase()
sensitive
semicolon ";"

5. 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
window.onload = function() {//actions here}
toUpperCase()
substring(startIndex, stopIndex)
f

6. ________ comments start with / and end with /.
Multi line
string
toFixed(digitCount)
v

7. The events common to most controls: onfocus - onblur - onclick - _______ - onchange - onselect
Number.NEGATIVE_INFINITY
event handler .
getFullYear()
ondblclick

8. To create a function in JavaScript
var functionName = function(param1, param2, paramN) {}
var answerVar = confirm("Message Text Here")
Math.max(var1, var2, varN)
Math.min(var1, var2, varN)

9. To insert Javascript into a web page
document.getElementById("CheckboxId").checked = true; //Could also be false
var stringVar = prompt("Text Here")
global
<script type="text/javascript">.....</script>

10. To set the control to be disabled for textboxes
document.getElementById("checkboxId").value;
v
var dateObject = new Date(year, month, day, hours, minutes, seconds, milliseconds)
document.getElementById("TextBoxId").disabled = true;

11. String object method used to return a new string that contains part of the original string from the specified start position
substring(startIndex)
expression
focus
var dateObject = new Date(year, month, day, hours, minutes, seconds, milliseconds)

12. To set focus on the control for textboxes
Multi line
document.getElementById("TextBoxId").focus;
toUpperCase()
var dateVar = new Date()

13. To create a Date object in JavaScript
var arrayVar = new Array()
toUpperCase()
toFixed(digitCount)
var dateVar = new Date()

14. To code a button.onclick event handler
\
document.getElementById("ButtonId").onclick = functionName;
Use a parse. Example : var intVar = parseInt(prompt("Text Here"))
global

15. What Date object method is used to return the number of milliseconds since the start of GMT
getTime()
for (counter; condition; incrementor) {}
r
substring(startIndex)

16. To code a while statement in JavaScript
toString(base)
toString()
Math.min(var1, var2, varN)
while (condition) {}

17. To get the current checked status of the control for checkboxes
document.getElementById("spanId").firstChild;
f
document.getElementById("checkboxId").checked;
getTime()

18. String object method used to get the character at a specified index position
standard equality operators
getTime()
f
charAt(position)

19. To view the current web address using JavaScript
window.location()
sensitive
Math.random() //Returns a value >= 0.0 but <1.0
\

20. Math object method used to return the lowest value for a set of supplied numbers
Math.min(var1, var2, varN)
Use a parse. Example : var intVar = parseInt(prompt("Text Here"))
var functionName = function(param1, param2, paramN) {}
if (condition) {}

21. Math object method used to return a given number raised to a given power
Underscores
Math.pow(number, power)
concat(var1, var2, varN)
Use a parse. Example : var intVar = parseInt(prompt("Text Here"))

22. The string escape sequence to start a new line in JavaScript
'
while (condition) {}
n
indexOf(searchValue, startPosition)

23. To test that a variable contains a valid number
getTime()
r
toString(base)
isNaN(varHere) //Returns true or false.

24. The available set methods for a Date object: setFullYear() - setMonth() - setDate() - setHours() - setMinutes() - setSeconds() - _________
Math.random() //Returns a value >= 0.0 but <1.0
alert("Alert Text Here")
setMilliseconds()
substring(startIndex, stopIndex)

25. The two methods common to most controls: ______ //Brings focus to the control blur //Removes focus from the control
string
focus
indexOf(searchValue, startPosition)
toFixed(digitCount)

26. To write text to the current element of the DOM
(Condition_Expression) ? Value_If_True : Value_If_False;
Objects
Math.pow(number, power)
document.write("Text Here") //Remains on current line

27. To code an If statement in JavaScript
document.getElementById("radioButtonId").value;
window.location = "New Web Address Here";
if (condition) {}
substring(startIndex, stopIndex)

28. To create a new Date object
Math.random() //Returns a value >= 0.0 but <1.0
var dateObject = new Date(year, month, day, hours, minutes, seconds, milliseconds)
concat(var1, var2, varN)
(Condition_Expression) ? Value_If_True : Value_If_False;

29. To create an Array object in JavaScript
for (counter; condition; incrementor) {}
standard equality operators
udddd
var arrayVar = new Array()

30. Unlike ________________ identity operators do not perform type coercion.
window.onload = function() {//actions here}
standard equality operators
document.getElementById("textAreaId").value;
Objects

31. Statements end in JavaScript with a ________
semicolon ";"
ondblclick
for (counter; condition; incrementor) {}
Math.ceil(number)

32. Math object method used to return the highest value from a set of supplied numbers
toFixed(digits)
Math.max(var1, var2, varN)
document.getElementById("TextBoxId").focus;
string

33. The string escape sequence to insert a double quote in JavaScript
window.onload = function() {//actions here}
var stringVar = prompt("Text Here")
"
document.getElementById("TextBoxId").value;

34. The valid characters for an identifier in JavaScript: Letters - Numbers - ________ and Dollar Signs
document.getElementById("listId").value;
concat(var1, var2, varN)
Underscores
getFullYear()

35. To get the current checked status of the control for radio buttons
Math.round(number)
document.getElementById("checkboxId").checked;
document.getElementById("radioButtonId").checked;
var dateObject = new Date(year, month, day, hours, minutes, seconds, milliseconds)

36. The _____ attribute is used to denote external file for script use
toTimeString()
"
Src - e.g. <script src="fileName.js"> //
Math.floor(number)

37. JavaScript is case _______
document.getElementById("ButtonId").onclick = functionName;
sensitive
toDateString()
t

38. The string escape sequence to insert a carriage return in JavaScript
toUpperCase()
Math.ceil(number)
toString(base)
r

39. To concatenate multiple parts into a string
var stringVar = "part 1:" + "part 2";
semicolon ";"
!==
var stringVar = prompt("Text Here")

40. To set the current checked status of the control for radio buttons
document.getElementById("radioButtonId").checked = true; //Could also be false
document.getElementById("CheckboxId").checked = true; //Could also be false
toString(base)
toUpperCase()

41. To get the current value for textboxes
Math.random() //Returns a value >= 0.0 but <1.0
substring(startIndex)
ondblclick
document.getElementById("TextBoxId").value;

42. To alter the value of the text element in a span tag
document.getElementById("radioButtonId").value;
string
document.getElementById("spanId").firstChild.nodeValue = "New Value";
setMilliseconds()

43. This returns only True or false values
var answerVar = confirm("Message Text Here")
confirm()
Math.random() //Returns a value >= 0.0 but <1.0
Use the second parameter. Example: prompt("Enter Age:", "18")

44. To create a single line comment in JavaScript
indexOf(searchValue, startPosition)
window.location()
Two forward slashes "//"
var arrayVar = new Array()

45. To denote a string in JavaScript
Either single or double quotes surrounding the data
document.getElementById("radioButtonId").checked;
document.getElementById("TextBoxId").value;
document.getElementById("spanId").firstChild.nodeValue = "New Value";

46. To assign a default value to a prompt
toDateString()
document.getElementById("spanId").firstChild;
Multi line
Use the second parameter. Example: prompt("Enter Age:", "18")

47. A list-like construct that has properties which corresponds to JavaScript values or variables or other objects.
Objects
Src - e.g. <script src="fileName.js"> //
Math.ceil(number)
Math.round(number)

48. Date object method used to return a string containing the date and time
var functionName = function(param1, param2, paramN) {}
redeclare
toString()
setMilliseconds()

49. Math object method used to return a random number
toFixed(digitCount)
Math.random() //Returns a value >= 0.0 but <1.0
setMilliseconds()
document.getElementById("radioButtonId").checked = true; //Could also be false

50. A _______ variable can be changed and accessed from within and without a function or object.
document.getElementById("spanId").firstChild.nodeValue = "New Value";
focus
global
confirm("Message Text Here")