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. To test that a variable contains a valid number
for (counter; condition; incrementor) {}
isNaN(varHere) //Returns true or false.
window.onload = function() {//actions here}
Number.NEGATIVE_INFINITY

2. To concatenate multiple parts into a string
document.writeln("Text Here") //Advances to new line after text
toDateString()
Src - e.g. <script src="fileName.js"> //
var stringVar = "part 1:" + "part 2";

3. Math object method used to return a random number
Math.random() //Returns a value >= 0.0 but <1.0
concat(var1, var2, varN)
getFullYear()
Math.sqrt(number)

4. To get the text value of the control for radio buttons
sensitive
focus
document.getElementById("radioButtonId").value;
var dateObject = new Date("11/22/2012 18:25:35")

5. Number object method used to return a number in exponential format with the specified number of decimal places
toExponential(digits)
redeclare
document.getElementById("TextBoxId").disabled = true;
getTime()

6. JavaScript is case _______
var functionName = function(param1, param2, paramN) {}
sensitive
document.getElementById("TextBoxId").focus;
Charset

7. The string escape sequence to insert a double quote in JavaScript
Src - e.g. <script src="fileName.js"> //
"
Math.abs(number)
var dateVar = new Date()

8. Number object method used to round numbers to the specified number of decimal places
for (counter; condition; incrementor) {}
Src - e.g. <script src="fileName.js"> //
document.getElementById("TextBoxId").focus;
toFixed(digits)

9. The string escape sequence to insert a vertical tab in JavaScript
document.getElementById("checkboxId").checked;
var stringVar = prompt("Text Here")
toString(base)
v

10. To assign the value from a prompt to a non-string variable
document.getElementById("TextBoxId").disabled = true;
toString(base)
Use a parse. Example : var intVar = parseInt(prompt("Text Here"))
var dateObject = new Date(year, month, day, hours, minutes, seconds, milliseconds)

11. To code a for statement in JavaScript
for (counter; condition; incrementor) {}
n
t
getTime()

12. The string escape sequence to insert a single quote in JavaScript

13. The string escape sequence to start a new line in JavaScript
toUpperCase()
n
ondblclick
var stringVar = "part 1:" + "part 2";

14. Math object method used to return the absolute value of a given number
Math.abs(number)
var dateVar = new Date()
document.getElementById("CheckboxId").checked = true; //Could also be false
<script type="text/javascript">.....</script>

15. The string escape sequence to insert a tab in JavaScript
Math.max(var1, var2, varN)
alert("Alert Text Here")
t
var answerVar = confirm("Message Text Here")

16. The syntax of a conditional operator
(Condition_Expression) ? Value_If_True : Value_If_False;
n
for (counter; condition; incrementor) {}
Multi line

17. A list-like construct that has properties which corresponds to JavaScript values or variables or other objects.
document.getElementById("TextBoxId").focus;
(Condition_Expression) ? Value_If_True : Value_If_False;
Math.sqrt(number)
Objects

18. To code a button.onclick event handler
document.getElementById("radioButtonId").value;
var stringVar = prompt("Text Here")
Math.min(var1, var2, varN)
document.getElementById("ButtonId").onclick = functionName;

19. To create a function in JavaScript
Math.ceil(number)
Math.floor(number)
var functionName = function(param1, param2, paramN) {}
substring(startIndex)

20. The four attributes of the <script> tag:Type - Src - _____ and Defer
Math.random() //Returns a value >= 0.0 but <1.0
Charset
(Condition_Expression) ? Value_If_True : Value_If_False;
!==

21. To access a page element by id
document.getElementById(id)
"
isNaN(varHere) //Returns true or false.
document.getElementById("TextBoxId").value;

22. Date object method used to return a string containing the time
toTimeString()
document.getElementById("TextBoxId").value;
prompt("Text Here")
standard equality operators

23. To get the value or the currently selected item for lists
document.getElementById("listId").value;
prompt("Text Here")
semicolon ";"
toFixed(digits)

24. Math object method used to return a given number rounded to the next lowest integer value
prompt("Text Here")
document.getElementById("spanId").firstChild.nodeValue = "New Value";
Math.floor(number)
document.getElementById(id)

25. To display an alert
Math.pow(number, power)
(Condition_Expression) ? Value_If_True : Value_If_False;
toFixed(digits)
alert("Alert Text Here")

26. To display a confirmation
t
document.getElementById("textAreaId").value = "Text Value";
confirm("Message Text Here")
document.getElementById("ButtonId").onclick = functionName;

27. The _____ attribute is used to denote external file for script use
t
Math.round(number)
document.writeln("Text Here") //Advances to new line after text
Src - e.g. <script src="fileName.js"> //

28. To get the text value of the control for radio buttons
document.getElementById("checkboxId").checked;
(Condition_Expression) ? Value_If_True : Value_If_False;
document.getElementById("checkboxId").value;
Math.ceil(number)

29. To create a new Date object
Src - e.g. <script src="fileName.js"> //
var dateObject = new Date(year, month, day, hours, minutes, seconds, milliseconds)
isNaN(varHere) //Returns true or false.
\

30. Math object method used to return a given number rounded to the next highest integer value
getTime()
global
Math.ceil(number)
toPrecision(precision)

31. A function that is called with a certain event occurs - e.g. button.onclick and window.onload.
event handler .
Math.min(var1, var2, varN)
Charset
document.getElementById("spanId").firstChild.nodeValue = "New Value";

32. To write text to the current element of the DOM
<noscript>
document.getElementById("radioButtonId").checked;
toFixed(digits)
document.write("Text Here") //Remains on current line

33. This returns only True or false values
string
'
confirm()
event handler .

34. When you add a string and a number the result will be a ____
string
Underscores
toLowerCase()
Math.ceil(number)

35. To set the digit precision of a decimal number
toFixed(digitCount)
document.getElementById("ButtonId").onclick = functionName;
substring(startIndex, stopIndex)
Use the second parameter. Example: prompt("Enter Age:", "18")

36. The available properties for the Number object: Number.MAX_VALUE - Number.MIN_VALUE - Number.POSITIVE_INFINITY - _______ - Number.NaN
substring(startIndex)
if (condition) {}
v
Number.NEGATIVE_INFINITY

37. A statement that yields a value
event handler .
toDateString()
expression
document.writeln("Text Here") //Advances to new line after text

38. Math object method used to return the square root of a given number
Math.sqrt(number)
Math.min(var1, var2, varN)
prompt("Text Here")
charAt(position)

39. To denote a string in JavaScript
Either single or double quotes surrounding the data
Use a parse. Example : var intVar = parseInt(prompt("Text Here"))
confirm()
!==

40. String object method used to return a new string that contains part of the original string from the specified start position
\
substring(startIndex)
for (counter; condition; incrementor) {}
redeclare

41. The string escape sequence to insert a backslash in JavaScript
while (condition) {}
\
var dateObject = new Date("11/22/2012 18:25:35")
Either single or double quotes surrounding the data

42. To create a single line comment in JavaScript
document.getElementById("TextBoxId").value;
alert("Alert Text Here")
Two forward slashes "//"
getTime()

43. To code a while statement in JavaScript
while (condition) {}
confirm()
for (counter; condition; incrementor) {}
var functionName = function(param1, param2, paramN) {}

44. What String object method returns a new string containing the value of the original string but in all upper case
document.getElementById("CheckboxId").checked = true; //Could also be false
toUpperCase()
Use a parse. Example : var intVar = parseInt(prompt("Text Here"))
!==

45. To get the current checked status of the control for checkboxes
document.getElementById("textAreaId").value;
document.getElementById("checkboxId").checked;
alert("Alert Text Here")
indexOf(searchValue, startPosition)

46. Date object method used to return a string containing the date
toFixed(digitCount)
toDateString()
Math.abs(number)
focus

47. When you __________ a javascript variable it retains its original value
t
redeclare
document.getElementById("radioButtonId").checked;
document.getElementById("checkboxId").checked;

48. To create a Date object in JavaScript
document.getElementById("checkboxId").value;
var dateVar = new Date()
Use the second parameter. Example: prompt("Enter Age:", "18")
\

49. Number object method used to return a string with a given number base
Math.abs(number)
Math.pow(number, power)
toUpperCase()
toString(base)

50. To view the current web address using JavaScript
var arrayVar = new Array()
v
window.location()
udddd