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. String object method used to return the position of the first instance of a specified search string starting from the specified index
toExponential(digits)
indexOf(searchValue, startPosition)
v
Math.random() //Returns a value >= 0.0 but <1.0

2. Math object method used to return a given number rounded to the next lowest integer value
Math.floor(number)
f
toFixed(digits)
Math.sqrt(number)

3. The identity operator for equals
<script type="text/javascript">.....</script>
document.getElementById("CheckboxId").checked = true; //Could also be false
Src - e.g. <script src="fileName.js"> //
===

4. To declare a variable in JavaScript
alert("Alert Text Here")
setMilliseconds()
var variableName;
global

5. To write a line to the current element of the DOM (Document Object Model)
udddd
var stringVar = "part 1:" + "part 2";
window.location = "New Web Address Here";
document.writeln("Text Here") //Advances to new line after text

6. The string escape sequence to insert a backslash in JavaScript
global
substring(startIndex, stopIndex)
toUpperCase()
\

7. The four attributes of the <script> tag:Type - Src - _____ and Defer
Multi line
isNaN(varHere) //Returns true or false.
Either single or double quotes surrounding the data
Charset

8. Math object method used to return a given number rounded to the next highest integer value
toDateString()
expression
Math.ceil(number)
window.onload = function() {//actions here}

9. Statements end in JavaScript with a ________
indexOf(searchValue, startPosition)
semicolon ";"
isNaN(varHere) //Returns true or false.
document.getElementById("TextBoxId").disabled = true;

10. To set the current checked status of the control for radio buttons
n
document.getElementById("radioButtonId").checked = true; //Could also be false
document.getElementById(id)
Math.random() //Returns a value >= 0.0 but <1.0

11. Math object method used to return a given number raised to a given power
Two forward slashes "//"
Charset
Math.pow(number, power)
document.write("Text Here") //Remains on current line

12. To get the current checked status of the control for radio buttons
v
document.getElementById("radioButtonId").checked;
document.getElementById("textAreaId").value = "Text Value";
document.getElementById("radioButtonId").value;

13. What String object method returns a new string containing the value of the original string but in all lower case
toFixed(digitCount)
toTimeString()
toLowerCase()
document.getElementById("TextBoxId").focus;

14. To assign the value from a prompt to a non-string variable
Either single or double quotes surrounding the data
Use a parse. Example : var intVar = parseInt(prompt("Text Here"))
charAt(position)
r

15. To access the text element in a <span> tag
f
var functionName = function(param1, param2, paramN) {}
toString(base)
document.getElementById("spanId").firstChild;

16. The identity operator for not equal
document.getElementById("textAreaId").value;
Math.max(var1, var2, varN)
global
!==

17. Command to display a prompt
<script type="text/javascript">.....</script>
var variableName;
(Condition_Expression) ? Value_If_True : Value_If_False;
prompt("Text Here")

18. The string escape sequence to insert a double quote in JavaScript
document.getElementById("textAreaId").value = "Text Value";
"
toPrecision(precision)
substring(startIndex)

19. To create a function that returns a value in JavaScript
var functionName = function(param1, param2, paramN) {}
ondblclick
document.getElementById("spanId").firstChild.nodeValue = "New Value";
===

20. To code a for statement in JavaScript
Underscores
redeclare
for (counter; condition; incrementor) {}
Math.floor(number)

21. Number object method used to return a string with a given number base
string
Math.round(number)
toString(base)
Math.min(var1, var2, varN)

22. Number object method used to round numbers to the specified number of decimal places
toFixed(digits)
n
document.getElementById("listId").value;
Use the second parameter. Example: prompt("Enter Age:", "18")

23. Number object method used to return a numerical string with the specified number of significant digits
document.getElementById("TextBoxId").focus;
document.getElementById("TextBoxId").value;
window.onload = function() {//actions here}
toPrecision(precision)

24. To create a new Date object
var dateObject = new Date(year, month, day, hours, minutes, seconds, milliseconds)
document.getElementById("CheckboxId").checked = true; //Could also be false
document.getElementById("spanId").firstChild.nodeValue = "New Value";
window.onload = function() {//actions here}

25. Date object method used to return a string containing the time
focus
document.getElementById("spanId").firstChild.nodeValue = "New Value";
toTimeString()
"

26. To code a button.onclick event handler
document.getElementById("ButtonId").onclick = functionName;
===
sensitive
Math.floor(number)

27. To assign actions to the window onLoad event
toLowerCase()
getTime()
toExponential(digits)
window.onload = function() {//actions here}

28. The available properties for the Number object: Number.MAX_VALUE - Number.MIN_VALUE - Number.POSITIVE_INFINITY - _______ - Number.NaN
Use the second parameter. Example: prompt("Enter Age:", "18")
Number.NEGATIVE_INFINITY
toExponential(digits)
expression

29. What Date object method is used to return the number of milliseconds since the start of GMT
getTime()
toUpperCase()
document.getElementById("textAreaId").value = "Text Value";
Math.pow(number, power)

30. To get the current value of the control for a text area
if (condition) {}
var arrayVar = new Array()
getFullYear()
document.getElementById("textAreaId").value;

31. Date object method used to return a string containing the date
window.location()
document.getElementById("TextBoxId").value;
v
toDateString()

32. String object method used to return a new string that contains part of the original string from the specified start position
substring(startIndex, stopIndex)
while (condition) {}
substring(startIndex)
toUpperCase()

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

34. The format to create a new Date object from a string
document.getElementById("listId").value;
confirm()
document.getElementById("CheckboxId").checked = true; //Could also be false
var dateObject = new Date("11/22/2012 18:25:35")

35. The available get methods for a Date object: getTime() - _________ - getMonth() - getDate() - getHours() - getMinutes() - getSeconds() - getMilliseconds()
document.writeln("Text Here") //Advances to new line after text
var dateVar = new Date()
var stringVar = prompt("Text Here")
getFullYear()

36. To create an Array object in JavaScript
sensitive
Charset
document.getElementById("checkboxId").value;
var arrayVar = new Array()

37. Number object method used to return a number in exponential format with the specified number of decimal places
Two forward slashes "//"
Use the second parameter. Example: prompt("Enter Age:", "18")
isNaN(varHere) //Returns true or false.
toExponential(digits)

38. Unlike ________________ identity operators do not perform type coercion.
string
<noscript>
toDateString()
standard equality operators

39. To get the text value of the control for radio buttons
redeclare
Math.abs(number)
Math.floor(number)
document.getElementById("radioButtonId").value;

40. The escape sequence used to insert a Unicode character into a string in JavaScript
toExponential(digits)
redeclare
while (condition) {}
udddd

41. To get the text value of the control for radio buttons
document.getElementById("checkboxId").value;
===
document.getElementById("radioButtonId").value;
document.getElementById("spanId").firstChild;

42. Date object method used to return a string containing the date and time
alert("Alert Text Here")
Either single or double quotes surrounding the data
n
toString()

43. To create a single line comment in JavaScript
document.getElementById("spanId").firstChild.nodeValue = "New Value";
getTime()
var stringVar = "part 1:" + "part 2";
Two forward slashes "//"

44. To set the current checked status of the control for checkboxes
r
document.getElementById("CheckboxId").checked = true; //Could also be false
expression
\

45. To access a page element by id
document.getElementById(id)
toLowerCase()
v
Math.sqrt(number)

46. What String object method returns a new string containing the value of the original string but in all upper case
toUpperCase()
while (condition) {}
if (condition) {}
Math.pow(number, power)

47. To denote a string in JavaScript
toDateString()
document.getElementById("spanId").firstChild.nodeValue = "New Value";
substring(startIndex)
Either single or double quotes surrounding the data

48. A list-like construct that has properties which corresponds to JavaScript values or variables or other objects.
Objects
confirm("Message Text Here")
toPrecision(precision)
var stringVar = prompt("Text Here")

49. String object method used to concatenate multiple strings
!==
toLowerCase()
concat(var1, var2, varN)
document.getElementById("CheckboxId").checked = true; //Could also be false

50. The string escape sequence to insert a tab in JavaScript
toDateString()
t
toFixed(digits)
document.getElementById("listId").value;