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 get the current checked status of the control for checkboxes
while (condition) {}
semicolon ";"
toDateString()
document.getElementById("checkboxId").checked;

2. To display a confirmation
Math.random() //Returns a value >= 0.0 but <1.0
document.getElementById("radioButtonId").value;
confirm("Message Text Here")
while (condition) {}

3. To test that a variable contains a valid number
toExponential(digits)
isNaN(varHere) //Returns true or false.
Math.floor(number)
(Condition_Expression) ? Value_If_True : Value_If_False;

4. To create a function that returns a value in JavaScript
var functionName = function(param1, param2, paramN) {}
document.writeln("Text Here") //Advances to new line after text
confirm()
document.getElementById("checkboxId").value;

5. This returns only True or false values
confirm()
var dateObject = new Date(year, month, day, hours, minutes, seconds, milliseconds)
Underscores
document.getElementById("TextBoxId").disabled = true;

6. To code an If statement in JavaScript
var dateVar = new Date()
document.getElementById("checkboxId").value;
window.location = "New Web Address Here";
if (condition) {}

7. To create an Array object in JavaScript
var arrayVar = new Array()
document.getElementById("spanId").firstChild;
var stringVar = "part 1:" + "part 2";
Two forward slashes "//"

8. To assign the return value of confirm() to a variable
var variableName;
getFullYear()
document.getElementById("TextBoxId").disabled = true;
var answerVar = confirm("Message Text Here")

9. Date object method used to return a string containing the time
Underscores
toTimeString()
var dateObject = new Date("11/22/2012 18:25:35")
var stringVar = prompt("Text Here")

10. A statement that yields a value
sensitive
expression
document.writeln("Text Here") //Advances to new line after text
var functionName = function(param1, param2, paramN) {}

11. The identity operator for not equal
var dateObject = new Date("11/22/2012 18:25:35")
!==
var dateVar = new Date()
Src - e.g. <script src="fileName.js"> //

12. Math object method used to return a given number rounded to the next highest integer value
var stringVar = "part 1:" + "part 2";
Objects
Math.ceil(number)
global

13. The string escape sequence to insert a double quote in JavaScript
"
var functionName = function(param1, param2, paramN) {}
confirm("Message Text Here")
while (condition) {}

14. Unlike ________________ identity operators do not perform type coercion.
concat(var1, var2, varN)
<script type="text/javascript">.....</script>
var functionName = function(param1, param2, paramN) {}
standard equality operators

15. Number object method used to return a string with a given number base
isNaN(varHere) //Returns true or false.
toString(base)
getTime()
document.getElementById("radioButtonId").checked = true; //Could also be false

16. To get the current checked status of the control for radio buttons
f
document.getElementById("radioButtonId").checked;
toFixed(digits)
var arrayVar = new Array()

17. To code a while statement in JavaScript
while (condition) {}
Math.sqrt(number)
toExponential(digits)
Math.max(var1, var2, varN)

18. The ________ tag is used to display the text between the opening and closing tag if JavaScript is disabled or otherwise not available
window.location()
document.writeln("Text Here") //Advances to new line after text
<noscript>
setMilliseconds()

19. A _______ variable can be changed and accessed from within and without a function or object.
\
Use a parse. Example : var intVar = parseInt(prompt("Text Here"))
ondblclick
global

20. To assign the value from a prompt to a non-string variable
document.writeln("Text Here") //Advances to new line after text
var stringVar = "part 1:" + "part 2";
Use a parse. Example : var intVar = parseInt(prompt("Text Here"))
window.location = "New Web Address Here";

21. To assign actions to the window onLoad event
concat(var1, var2, varN)
window.onload = function() {//actions here}
document.getElementById("textAreaId").value;
getTime()

22. To declare a variable in JavaScript
Use the second parameter. Example: prompt("Enter Age:", "18")
n
document.getElementById("ButtonId").onclick = functionName;
var variableName;

23. To get the current value for textboxes
document.getElementById("TextBoxId").value;
Multi line
Math.random() //Returns a value >= 0.0 but <1.0
focus

24. To write a line to the current element of the DOM (Document Object Model)
prompt("Text Here")
Math.random() //Returns a value >= 0.0 but <1.0
toDateString()
document.writeln("Text Here") //Advances to new line after text

25. The format to create a new Date object from a string
var dateVar = new Date()
n
var dateObject = new Date("11/22/2012 18:25:35")
Two forward slashes "//"

26. To access a page element by id
var variableName;
Math.min(var1, var2, varN)
document.getElementById(id)
Two forward slashes "//"

27. The _____ attribute is used to denote external file for script use
Math.random() //Returns a value >= 0.0 but <1.0
confirm()
Src - e.g. <script src="fileName.js"> //
sensitive

28. A list-like construct that has properties which corresponds to JavaScript values or variables or other objects.
for (counter; condition; incrementor) {}
var stringVar = prompt("Text Here")
===
Objects

29. Math object method used to return a given number raised to a given power
toFixed(digits)
Math.pow(number, power)
alert("Alert Text Here")
document.getElementById("checkboxId").checked;

30. The string escape sequence to insert a backslash in JavaScript
var variableName;
\
Math.random() //Returns a value >= 0.0 but <1.0
document.getElementById("spanId").firstChild;

31. To concatenate multiple parts into a string
var arrayVar = new Array()
Math.sqrt(number)
var stringVar = "part 1:" + "part 2";
Use the second parameter. Example: prompt("Enter Age:", "18")

32. The two methods common to most controls: ______ //Brings focus to the control blur //Removes focus from the control
Use the second parameter. Example: prompt("Enter Age:", "18")
document.getElementById("checkboxId").checked;
r
focus

33. To display an alert
alert("Alert Text Here")
confirm("Message Text Here")
if (condition) {}
global

34. What String object method returns a new string containing the value of the original string but in all lower case
'
toLowerCase()
Math.floor(number)
Either single or double quotes surrounding the data

35. What Date object method is used to return the number of milliseconds since the start of GMT
getTime()
document.getElementById("spanId").firstChild;
document.getElementById("TextBoxId").value;
getFullYear()

36. To set the digit precision of a decimal number
Use the second parameter. Example: prompt("Enter Age:", "18")
substring(startIndex, stopIndex)
Either single or double quotes surrounding the data
toFixed(digitCount)

37. The string escape sequence to insert a tab in JavaScript
t
indexOf(searchValue, startPosition)
string
redeclare

38. The four attributes of the <script> tag:Type - Src - _____ and Defer
focus
Charset
document.write("Text Here") //Remains on current line
toExponential(digits)

39. A function that is called with a certain event occurs - e.g. button.onclick and window.onload.
Math.floor(number)
event handler .
Math.round(number)
setMilliseconds()

40. To set the current checked status of the control for radio buttons
document.getElementById("listId").value;
sensitive
document.getElementById("radioButtonId").checked = true; //Could also be false
var answerVar = confirm("Message Text Here")

41. Math object method used to return the lowest value for a set of supplied numbers
document.getElementById("spanId").firstChild;
concat(var1, var2, varN)
"
Math.min(var1, var2, varN)

42. Number object method used to return a numerical string with the specified number of significant digits
toPrecision(precision)
Two forward slashes "//"
Number.NEGATIVE_INFINITY
!==

43. Math object method used to return a random number
document.getElementById("checkboxId").value;
<noscript>
Math.random() //Returns a value >= 0.0 but <1.0
Math.floor(number)

44. Math object method used to return a given number rounded to the next lowest integer value
toString(base)
document.getElementById("checkboxId").value;
Math.floor(number)
Math.sqrt(number)

45. Math object method used to return the highest value from a set of supplied numbers
toExponential(digits)
toDateString()
Math.max(var1, var2, varN)
Math.round(number)

46. ________ comments start with / and end with /.
document.getElementById("checkboxId").checked;
Multi line
document.getElementById("TextBoxId").focus;
var dateVar = new Date()

47. The valid characters for an identifier in JavaScript: Letters - Numbers - ________ and Dollar Signs
document.getElementById("ButtonId").onclick = functionName;
Underscores
\
event handler .

48. The string escape sequence to insert a form feed in JavaScript
===
var functionName = function(param1, param2, paramN) {}
f
var dateObject = new Date("11/22/2012 18:25:35")

49. The identity operator for equals
var answerVar = confirm("Message Text Here")
sensitive
===
toTimeString()

50. To make the browser load a new page using JavaScript
document.getElementById("radioButtonId").checked;
window.location = "New Web Address Here";
Math.pow(number, power)
var dateObject = new Date(year, month, day, hours, minutes, seconds, milliseconds)