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 concatenate multiple parts into a string
concat(var1, var2, varN)
document.getElementById(id)
var stringVar = "part 1:" + "part 2";
Math.random() //Returns a value >= 0.0 but <1.0

2. To code a while statement in JavaScript
Math.floor(number)
semicolon ";"
t
while (condition) {}

3. Math object method used to return a given number that has been rounded to the closes integer value
ondblclick
substring(startIndex)
Math.round(number)
udddd

4. To set focus on the control for textboxes
toLowerCase()
document.getElementById("TextBoxId").focus;
Multi line
toString(base)

5. Math object method used to return a random number
sensitive
(Condition_Expression) ? Value_If_True : Value_If_False;
Math.sqrt(number)
Math.random() //Returns a value >= 0.0 but <1.0

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

7. The string escape sequence to insert a form feed in JavaScript
f
sensitive
"
(Condition_Expression) ? Value_If_True : Value_If_False;

8. JavaScript is case _______
sensitive
<noscript>
document.getElementById("spanId").firstChild;
expression

9. Number object method used to return a numerical string with the specified number of significant digits
if (condition) {}
for (counter; condition; incrementor) {}
toPrecision(precision)
alert("Alert Text Here")

10. A list-like construct that has properties which corresponds to JavaScript values or variables or other objects.
Objects
Either single or double quotes surrounding the data
document.getElementById("ButtonId").onclick = functionName;
indexOf(searchValue, startPosition)

11. Math object method used to return a given number rounded to the next lowest integer value
toUpperCase()
Use the second parameter. Example: prompt("Enter Age:", "18")
Math.floor(number)
Objects

12. To set the current checked status of the control for checkboxes
document.getElementById("CheckboxId").checked = true; //Could also be false
"
toFixed(digits)
Two forward slashes "//"

13. ________ comments start with / and end with /.
indexOf(searchValue, startPosition)
Multi line
document.getElementById("checkboxId").value;
string

14. To create a function in JavaScript
var functionName = function(param1, param2, paramN) {}
toTimeString()
\
Number.NEGATIVE_INFINITY

15. 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
Math.random() //Returns a value >= 0.0 but <1.0
substring(startIndex, stopIndex)
"
Src - e.g. <script src="fileName.js"> //

16. To write a line to the current element of the DOM (Document Object Model)
<script type="text/javascript">.....</script>
standard equality operators
document.writeln("Text Here") //Advances to new line after text
document.getElementById(id)

17. The string escape sequence to insert a double quote in JavaScript
Number.NEGATIVE_INFINITY
isNaN(varHere) //Returns true or false.
"
===

18. To access a page element by id
Math.floor(number)
document.getElementById(id)
Either single or double quotes surrounding the data
Src - e.g. <script src="fileName.js"> //

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

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183

20. The _____ attribute is used to denote external file for script use
\
Math.round(number)
Src - e.g. <script src="fileName.js"> //
toFixed(digitCount)

21. To assign the value from a prompt to a string
var stringVar = prompt("Text Here")
document.getElementById("listId").value;
if (condition) {}
indexOf(searchValue, startPosition)

22. To make the browser load a new page using JavaScript
t
document.getElementById("TextBoxId").value;
window.location = "New Web Address Here";
Underscores

23. The string escape sequence to insert a vertical tab in JavaScript
!==
document.getElementById("TextBoxId").focus;
document.getElementById("spanId").firstChild;
v

24. To alter the value of the text element in a span tag
document.getElementById("spanId").firstChild.nodeValue = "New Value";
Either single or double quotes surrounding the data
isNaN(varHere) //Returns true or false.
===

25. To create a Date object in JavaScript
Charset
document.writeln("Text Here") //Advances to new line after text
Math.min(var1, var2, varN)
var dateVar = new Date()

26. The available properties for the Number object: Number.MAX_VALUE - Number.MIN_VALUE - Number.POSITIVE_INFINITY - _______ - Number.NaN
sensitive
Objects
Number.NEGATIVE_INFINITY
Math.abs(number)

27. The identity operator for equals
===
Math.floor(number)
window.onload = function() {//actions here}
var variableName;

28. Math object method used to return the lowest value for a set of supplied numbers
var dateVar = new Date()
Math.min(var1, var2, varN)
document.getElementById("ButtonId").onclick = functionName;
var stringVar = "part 1:" + "part 2";

29. To code a button.onclick event handler
Math.sqrt(number)
n
document.getElementById("ButtonId").onclick = functionName;
substring(startIndex, stopIndex)

30. Math object method used to return the highest value from a set of supplied numbers
toFixed(digits)
redeclare
Multi line
Math.max(var1, var2, varN)

31. To get the value or the currently selected item for lists
udddd
document.getElementById("checkboxId").value;
document.getElementById("listId").value;
Math.pow(number, power)

32. To get the current checked status of the control for checkboxes
document.getElementById("checkboxId").checked;
Objects
setMilliseconds()
getFullYear()

33. To get the current checked status of the control for radio buttons
document.getElementById("radioButtonId").checked;
global
getTime()
expression

34. The valid characters for an identifier in JavaScript: Letters - Numbers - ________ and Dollar Signs
Underscores
toPrecision(precision)
Use the second parameter. Example: prompt("Enter Age:", "18")
window.onload = function() {//actions here}

35. When you add a string and a number the result will be a ____
toFixed(digits)
global
string
t

36. What String object method returns a new string containing the value of the original string but in all upper case
toUpperCase()
prompt("Text Here")
Number.NEGATIVE_INFINITY
sensitive

37. The four attributes of the <script> tag:Type - Src - _____ and Defer
for (counter; condition; incrementor) {}
Math.min(var1, var2, varN)
getFullYear()
Charset

38. Date object method used to return a string containing the time
<script type="text/javascript">.....</script>
toPrecision(precision)
toTimeString()
var arrayVar = new Array()

39. To denote a string in JavaScript
toFixed(digitCount)
(Condition_Expression) ? Value_If_True : Value_If_False;
for (counter; condition; incrementor) {}
Either single or double quotes surrounding the data

40. To test that a variable contains a valid number
var arrayVar = new Array()
isNaN(varHere) //Returns true or false.
document.getElementById("textAreaId").value = "Text Value";
Math.min(var1, var2, varN)

41. A _______ variable can be changed and accessed from within and without a function or object.
n
substring(startIndex, stopIndex)
getTime()
global

42. To access the text element in a <span> tag
Underscores
document.writeln("Text Here") //Advances to new line after text
substring(startIndex)
document.getElementById("spanId").firstChild;

43. Math object method used to return a given number raised to a given power
<script type="text/javascript">.....</script>
document.write("Text Here") //Remains on current line
Math.pow(number, power)
Objects

44. To get the text value of the control for radio buttons
Math.round(number)
document.getElementById("radioButtonId").value;
ondblclick
document.getElementById("textAreaId").value = "Text Value";

45. To create an Array object in JavaScript
"
toExponential(digits)
var arrayVar = new Array()
(Condition_Expression) ? Value_If_True : Value_If_False;

46. To get the text value of the control for radio buttons
sensitive
document.getElementById("checkboxId").value;
document.getElementById(id)
window.location()

47. To assign the value from a prompt to a non-string variable
Use a parse. Example : var intVar = parseInt(prompt("Text Here"))
var variableName;
toFixed(digitCount)
Math.pow(number, power)

48. The string escape sequence to insert a backslash in JavaScript
document.getElementById("spanId").firstChild;
indexOf(searchValue, startPosition)
\
toFixed(digits)

49. To set the current value of the control for a text area
document.getElementById("textAreaId").value = "Text Value";
var functionName = function(param1, param2, paramN) {}
Math.min(var1, var2, varN)
Math.round(number)

50. Unlike ________________ identity operators do not perform type coercion.
concat(var1, var2, varN)
n
standard equality operators
getTime()