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. The escape sequence used to insert a Unicode character into a string in JavaScript
===
isNaN(varHere) //Returns true or false.
toString(base)
udddd

2. To insert Javascript into a web page
toTimeString()
"
<script type="text/javascript">.....</script>
Underscores

3. Date object method used to return a string containing the date
Math.ceil(number)
toDateString()
toString(base)
toUpperCase()

4. Math object method used to return the absolute value of a given number
toString()
standard equality operators
Math.abs(number)
Math.round(number)

5. To test that a variable contains a valid number
var stringVar = prompt("Text Here")
setMilliseconds()
var functionName = function(param1, param2, paramN) {}
isNaN(varHere) //Returns true or false.

6. The _____ attribute is used to denote external file for script use
Src - e.g. <script src="fileName.js"> //
Underscores
indexOf(searchValue, startPosition)
toTimeString()

7. To create a function that returns a value in JavaScript
document.getElementById("TextBoxId").focus;
var functionName = function(param1, param2, paramN) {}
substring(startIndex, stopIndex)
charAt(position)

8. To view the current web address using JavaScript
window.location()
var dateObject = new Date("11/22/2012 18:25:35")
while (condition) {}
document.getElementById("radioButtonId").checked = true; //Could also be false

9. The identity operator for not equal
!==
indexOf(searchValue, startPosition)
standard equality operators
\

10. To access the text element in a <span> tag
semicolon ";"
Two forward slashes "//"
document.getElementById("spanId").firstChild;
t

11. Math object method used to return a given number rounded to the next highest integer value
Math.ceil(number)
toExponential(digits)
\
document.getElementById("spanId").firstChild;

12. The string escape sequence to insert a form feed in JavaScript
document.getElementById("radioButtonId").checked = true; //Could also be false
===
f
Multi line

13. Date object method used to return a string containing the time
Number.NEGATIVE_INFINITY
semicolon ";"
toTimeString()
(Condition_Expression) ? Value_If_True : Value_If_False;

14. What String object method returns a new string containing the value of the original string but in all upper case
Math.pow(number, power)
Either single or double quotes surrounding the data
toUpperCase()
document.getElementById("textAreaId").value;

15. To get the current checked status of the control for checkboxes
document.getElementById("checkboxId").checked;
t
toDateString()
document.getElementById("spanId").firstChild.nodeValue = "New Value";

16. The string escape sequence to start a new line in JavaScript
n
concat(var1, var2, varN)
toUpperCase()
document.getElementById("TextBoxId").focus;

17. To access a page element by id
prompt("Text Here")
document.getElementById(id)
Math.random() //Returns a value >= 0.0 but <1.0
toUpperCase()

18. Number object method used to return a number in exponential format with the specified number of decimal places
var arrayVar = new Array()
toDateString()
Math.round(number)
toExponential(digits)

19. Statements end in JavaScript with a ________
semicolon ";"
document.getElementById("textAreaId").value = "Text Value";
document.getElementById("TextBoxId").value;
"

20. Math object method used to return the highest value from a set of supplied numbers
Math.max(var1, var2, varN)
window.location = "New Web Address Here";
<noscript>
if (condition) {}

21. To get the text value of the control for radio buttons
document.getElementById("spanId").firstChild.nodeValue = "New Value";
semicolon ";"
document.getElementById("checkboxId").value;
Math.pow(number, power)

22. The string escape sequence to insert a tab in JavaScript
Math.sqrt(number)
string
document.getElementById("TextBoxId").disabled = true;
t

23. The valid characters for an identifier in JavaScript: Letters - Numbers - ________ and Dollar Signs
getTime()
substring(startIndex)
Underscores
document.getElementById("checkboxId").value;

24. To alter the value of the text element in a span tag
document.getElementById("spanId").firstChild.nodeValue = "New Value";
var stringVar = prompt("Text Here")
Math.floor(number)
prompt("Text Here")

25. To set the current checked status of the control for radio buttons
document.getElementById("radioButtonId").checked = true; //Could also be false
redeclare
Math.abs(number)
toExponential(digits)

26. The available get methods for a Date object: getTime() - _________ - getMonth() - getDate() - getHours() - getMinutes() - getSeconds() - getMilliseconds()
document.getElementById("spanId").firstChild;
confirm("Message Text Here")
getFullYear()
var functionName = function(param1, param2, paramN) {}

27. To concatenate multiple parts into a string
var stringVar = "part 1:" + "part 2";
semicolon ";"
document.getElementById("checkboxId").value;
string

28. To code a while statement in JavaScript
setMilliseconds()
global
while (condition) {}
Underscores

29. To display a confirmation
confirm("Message Text Here")
Underscores
var stringVar = prompt("Text Here")
for (counter; condition; incrementor) {}

30. The format to create a new Date object from a string
var dateObject = new Date("11/22/2012 18:25:35")
Use a parse. Example : var intVar = parseInt(prompt("Text Here"))
document.getElementById("CheckboxId").checked = true; //Could also be false
v

31. Unlike ________________ identity operators do not perform type coercion.
standard equality operators
===
if (condition) {}
document.getElementById("textAreaId").value = "Text Value";

32. To create a new Date object
Math.pow(number, power)
var dateObject = new Date(year, month, day, hours, minutes, seconds, milliseconds)
var stringVar = "part 1:" + "part 2";
r

33. To set the digit precision of a decimal number
Math.max(var1, var2, varN)
r
if (condition) {}
toFixed(digitCount)

34. The ________ tag is used to display the text between the opening and closing tag if JavaScript is disabled or otherwise not available
while (condition) {}
window.location()
<noscript>
var dateObject = new Date(year, month, day, hours, minutes, seconds, milliseconds)

35. Command to display a prompt
document.getElementById("radioButtonId").checked;
Src - e.g. <script src="fileName.js"> //
n
prompt("Text Here")

36. To set the control to be disabled for textboxes
document.getElementById("TextBoxId").disabled = true;
var dateObject = new Date(year, month, day, hours, minutes, seconds, milliseconds)
document.getElementById("CheckboxId").checked = true; //Could also be false
document.getElementById("ButtonId").onclick = functionName;

37. String object method used to get the character at a specified index position
charAt(position)
toExponential(digits)
document.getElementById(id)
Charset

38. To code a for statement in JavaScript
Math.ceil(number)
event handler .
Charset
for (counter; condition; incrementor) {}

39. To get the current checked status of the control for radio buttons
toUpperCase()
var arrayVar = new Array()
<noscript>
document.getElementById("radioButtonId").checked;

40. To set the current value of the control for a text area
document.getElementById("listId").value;
udddd
toFixed(digits)
document.getElementById("textAreaId").value = "Text Value";

41. To get the current value of the control for a text area
toLowerCase()
document.write("Text Here") //Remains on current line
var dateVar = new Date()
document.getElementById("textAreaId").value;

42. To code an If statement in JavaScript
toExponential(digits)
redeclare
toDateString()
if (condition) {}

43. The identity operator for equals
f
<noscript>
document.getElementById("radioButtonId").checked;
===

44. Math object method used to return a given number that has been rounded to the closes integer value
focus
document.getElementById("spanId").firstChild.nodeValue = "New Value";
substring(startIndex, stopIndex)
Math.round(number)

45. String object method used to return the position of the first instance of a specified search string starting from the specified index
document.getElementById("checkboxId").checked;
setMilliseconds()
toLowerCase()
indexOf(searchValue, startPosition)

46. To code a button.onclick event handler
document.getElementById("spanId").firstChild.nodeValue = "New Value";
Math.random() //Returns a value >= 0.0 but <1.0
document.getElementById("ButtonId").onclick = functionName;
toExponential(digits)

47. String object method used to concatenate multiple strings
while (condition) {}
concat(var1, var2, varN)
standard equality operators
var variableName;

48. The syntax of a conditional operator
focus
Underscores
document.write("Text Here") //Remains on current line
(Condition_Expression) ? Value_If_True : Value_If_False;

49. JavaScript is case _______
sensitive
Math.abs(number)
document.getElementById("checkboxId").value;
document.getElementById("checkboxId").checked;

50. The events common to most controls: onfocus - onblur - onclick - _______ - onchange - onselect
Underscores
document.getElementById("TextBoxId").disabled = true;
confirm()
ondblclick