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. When you add a string and a number the result will be a ____
confirm()
Either single or double quotes surrounding the data
string
"

2. The escape sequence used to insert a Unicode character into a string in JavaScript
udddd
event handler .
concat(var1, var2, varN)
var dateObject = new Date(year, month, day, hours, minutes, seconds, milliseconds)

3. A function that is called with a certain event occurs - e.g. button.onclick and window.onload.
event handler .
sensitive
Math.floor(number)
isNaN(varHere) //Returns true or false.

4. To test that a variable contains a valid number
document.getElementById("CheckboxId").checked = true; //Could also be false
isNaN(varHere) //Returns true or false.
document.getElementById("checkboxId").value;
getFullYear()

5. Number object method used to return a number in exponential format with the specified number of decimal places
document.getElementById("checkboxId").checked;
Math.round(number)
toExponential(digits)
event handler .

6. Date object method used to return a string containing the date
semicolon ";"
Math.ceil(number)
charAt(position)
toDateString()

7. Date object method used to return a string containing the date and time
Charset
document.getElementById("ButtonId").onclick = functionName;
Use a parse. Example : var intVar = parseInt(prompt("Text Here"))
toString()

8. Math object method used to return a given number rounded to the next lowest integer value
Math.abs(number)
Math.floor(number)
var functionName = function(param1, param2, paramN) {}
toString()

9. The string escape sequence to insert a vertical tab in JavaScript
while (condition) {}
var dateVar = new Date()
v
document.getElementById("TextBoxId").focus;

10. A _______ variable can be changed and accessed from within and without a function or object.
substring(startIndex, stopIndex)
(Condition_Expression) ? Value_If_True : Value_If_False;
global
redeclare

11. Math object method used to return a given number that has been rounded to the closes integer value
getFullYear()
toFixed(digitCount)
Math.round(number)
confirm()

12. To code a for statement in JavaScript
document.getElementById("radioButtonId").checked;
for (counter; condition; incrementor) {}
Two forward slashes "//"
document.getElementById("radioButtonId").checked = true; //Could also be false

13. The available set methods for a Date object: setFullYear() - setMonth() - setDate() - setHours() - setMinutes() - setSeconds() - _________
setMilliseconds()
r
document.getElementById("spanId").firstChild.nodeValue = "New Value";
Underscores

14. To create a Date object in JavaScript
var stringVar = prompt("Text Here")
===
isNaN(varHere) //Returns true or false.
var dateVar = new Date()

15. ________ comments start with / and end with /.
semicolon ";"
getFullYear()
Multi line
substring(startIndex)

16. The available properties for the Number object: Number.MAX_VALUE - Number.MIN_VALUE - Number.POSITIVE_INFINITY - _______ - Number.NaN
Use a parse. Example : var intVar = parseInt(prompt("Text Here"))
substring(startIndex, stopIndex)
Number.NEGATIVE_INFINITY
Src - e.g. <script src="fileName.js"> //

17. The identity operator for not equal
document.getElementById("TextBoxId").value;
!==
toLowerCase()
Math.random() //Returns a value >= 0.0 but <1.0

18. The string escape sequence to insert a carriage return in JavaScript
r
"
substring(startIndex, stopIndex)
expression

19. String object method used to get the character at a specified index position
document.getElementById("TextBoxId").value;
charAt(position)
Two forward slashes "//"
prompt("Text Here")

20. To display an alert
document.getElementById("TextBoxId").disabled = true;
charAt(position)
Underscores
alert("Alert Text Here")

21. To get the current checked status of the control for checkboxes
r
standard equality operators
document.writeln("Text Here") //Advances to new line after text
document.getElementById("checkboxId").checked;

22. This returns only True or false values
document.getElementById("listId").value;
confirm()
getFullYear()
Math.sqrt(number)

23. The available get methods for a Date object: getTime() - _________ - getMonth() - getDate() - getHours() - getMinutes() - getSeconds() - getMilliseconds()
var stringVar = prompt("Text Here")
string
f
getFullYear()

24. Date object method used to return a string containing the time
document.getElementById(id)
expression
toFixed(digitCount)
toTimeString()

25. To assign a default value to a prompt
Use the second parameter. Example: prompt("Enter Age:", "18")
t
var functionName = function(param1, param2, paramN) {}
confirm("Message Text Here")

26. To get the value or the currently selected item for lists
document.getElementById("spanId").firstChild;
Math.abs(number)
var arrayVar = new Array()
document.getElementById("listId").value;

27. To create a function in JavaScript
<script type="text/javascript">.....</script>
toPrecision(precision)
confirm("Message Text Here")
var functionName = function(param1, param2, paramN) {}

28. Number object method used to return a numerical string with the specified number of significant digits
var functionName = function(param1, param2, paramN) {}
(Condition_Expression) ? Value_If_True : Value_If_False;
Math.max(var1, var2, varN)
toPrecision(precision)

29. To set the control to be disabled for textboxes
Underscores
Use a parse. Example : var intVar = parseInt(prompt("Text Here"))
Multi line
document.getElementById("TextBoxId").disabled = true;

30. To assign the value from a prompt to a string
event handler .
var stringVar = prompt("Text Here")
Number.NEGATIVE_INFINITY
'

31. To assign the return value of confirm() to a variable
window.onload = function() {//actions here}
'
var answerVar = confirm("Message Text Here")
var variableName;

32. To set focus on the control for textboxes
standard equality operators
document.getElementById("TextBoxId").focus;
sensitive
document.getElementById("textAreaId").value;

33. To assign actions to the window onLoad event
window.location()
toLowerCase()
window.onload = function() {//actions here}
document.getElementById("textAreaId").value;

34. To denote a string in JavaScript
document.getElementById("checkboxId").value;
Either single or double quotes surrounding the data
document.getElementById("TextBoxId").disabled = true;
t

35. 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
document.getElementById("TextBoxId").value;
document.getElementById("TextBoxId").disabled = true;
toTimeString()
substring(startIndex, stopIndex)

36. To write a line to the current element of the DOM (Document Object Model)
var stringVar = "part 1:" + "part 2";
<script type="text/javascript">.....</script>
document.writeln("Text Here") //Advances to new line after text
substring(startIndex)

37. To set the digit precision of a decimal number
var arrayVar = new Array()
toFixed(digitCount)
Number.NEGATIVE_INFINITY
Math.random() //Returns a value >= 0.0 but <1.0

38. To insert Javascript into a web page
window.location = "New Web Address Here";
toString()
!==
<script type="text/javascript">.....</script>

39. The events common to most controls: onfocus - onblur - onclick - _______ - onchange - onselect
Math.abs(number)
ondblclick
toFixed(digits)
!==

40. The string escape sequence to insert a backslash in JavaScript
document.write("Text Here") //Remains on current line
\
confirm("Message Text Here")
document.getElementById("spanId").firstChild.nodeValue = "New Value";

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

42. To concatenate multiple parts into a string
===
var stringVar = "part 1:" + "part 2";
ondblclick
document.getElementById("TextBoxId").focus;

43. What String object method returns a new string containing the value of the original string but in all lower case
setMilliseconds()
\
redeclare
toLowerCase()

44. Number object method used to return a string with a given number base
document.getElementById("radioButtonId").checked = true; //Could also be false
toString(base)
substring(startIndex, stopIndex)
var stringVar = "part 1:" + "part 2";

45. Math object method used to return the lowest value for a set of supplied numbers
Use a parse. Example : var intVar = parseInt(prompt("Text Here"))
confirm()
Charset
Math.min(var1, var2, varN)

46. String object method used to concatenate multiple strings
focus
string
var functionName = function(param1, param2, paramN) {}
concat(var1, var2, varN)

47. To write text to the current element of the DOM
semicolon ";"
\
document.write("Text Here") //Remains on current line
standard equality operators

48. To get the text value of the control for radio buttons
<noscript>
document.getElementById("checkboxId").checked;
window.onload = function() {//actions here}
document.getElementById("radioButtonId").value;

49. To get the current checked status of the control for radio buttons
document.getElementById("radioButtonId").checked;
Math.sqrt(number)
ondblclick
confirm()

50. To create a function that returns a value in JavaScript
confirm()
var functionName = function(param1, param2, paramN) {}
substring(startIndex, stopIndex)
concat(var1, var2, varN)