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 code an If statement in JavaScript
Src - e.g. <script src="fileName.js"> //
Multi line
var stringVar = prompt("Text Here")
if (condition) {}

2. To set the current checked status of the control for radio buttons
document.getElementById("TextBoxId").value;
document.getElementById("radioButtonId").checked = true; //Could also be false
string
===

3. To get the current checked status of the control for checkboxes
expression
document.getElementById("checkboxId").checked;
document.getElementById("spanId").firstChild;
var functionName = function(param1, param2, paramN) {}

4. What String object method returns a new string containing the value of the original string but in all upper case
toPrecision(precision)
document.getElementById("spanId").firstChild.nodeValue = "New Value";
toUpperCase()
confirm("Message Text Here")

5. To assign the return value of confirm() to a variable
var answerVar = confirm("Message Text Here")
document.getElementById("radioButtonId").checked = true; //Could also be false
document.getElementById("TextBoxId").disabled = true;
window.onload = function() {//actions here}

6. To test that a variable contains a valid number
isNaN(varHere) //Returns true or false.
\
semicolon ";"
var dateObject = new Date("11/22/2012 18:25:35")

7. The available get methods for a Date object: getTime() - _________ - getMonth() - getDate() - getHours() - getMinutes() - getSeconds() - getMilliseconds()
===
document.getElementById("textAreaId").value = "Text Value";
document.getElementById("listId").value;
getFullYear()

8. To concatenate multiple parts into a string
var stringVar = "part 1:" + "part 2";
var answerVar = confirm("Message Text Here")
var variableName;
document.getElementById("radioButtonId").checked = true; //Could also be false

9. When you add a string and a number the result will be a ____
Src - e.g. <script src="fileName.js"> //
Two forward slashes "//"
document.getElementById("radioButtonId").checked = true; //Could also be false
string

10. The available set methods for a Date object: setFullYear() - setMonth() - setDate() - setHours() - setMinutes() - setSeconds() - _________
Math.abs(number)
setMilliseconds()
t
confirm("Message Text Here")

11. To access the text element in a <span> tag
focus
toFixed(digits)
document.getElementById("spanId").firstChild;
document.getElementById("TextBoxId").value;

12. Date object method used to return a string containing the date
Math.floor(number)
global
Math.round(number)
toDateString()

13. Math object method used to return the highest value from a set of supplied numbers
document.getElementById("spanId").firstChild.nodeValue = "New Value";
document.getElementById("TextBoxId").disabled = true;
Multi line
Math.max(var1, var2, varN)

14. To get the value or the currently selected item for lists
var functionName = function(param1, param2, paramN) {}
toString()
Either single or double quotes surrounding the data
document.getElementById("listId").value;

15. Math object method used to return a given number raised to a given power
Math.pow(number, power)
window.location = "New Web Address Here";
toString()
var dateObject = new Date(year, month, day, hours, minutes, seconds, milliseconds)

16. The string escape sequence to start a new line in JavaScript
n
expression
global
charAt(position)

17. To create a single line comment in JavaScript
document.getElementById("checkboxId").checked;
Two forward slashes "//"
toFixed(digits)
Use the second parameter. Example: prompt("Enter Age:", "18")

18. String object method used to return a new string that contains part of the original string from the specified start position
window.onload = function() {//actions here}
concat(var1, var2, varN)
substring(startIndex)
confirm("Message Text Here")

19. The valid characters for an identifier in JavaScript: Letters - Numbers - ________ and Dollar Signs
Underscores
semicolon ";"
Math.floor(number)
Math.ceil(number)

20. Unlike ________________ identity operators do not perform type coercion.
\
document.getElementById("ButtonId").onclick = functionName;
standard equality operators
if (condition) {}

21. Math object method used to return the lowest value for a set of supplied numbers
"
var stringVar = "part 1:" + "part 2";
document.getElementById("spanId").firstChild;
Math.min(var1, var2, varN)

22. To create a function that returns a value in JavaScript
document.getElementById("TextBoxId").focus;
v
var functionName = function(param1, param2, paramN) {}
Math.ceil(number)

23. The string escape sequence to insert a tab in JavaScript
setMilliseconds()
t
semicolon ";"
if (condition) {}

24. To write text to the current element of the DOM
document.write("Text Here") //Remains on current line
window.location = "New Web Address Here";
Math.pow(number, power)
concat(var1, var2, varN)

25. The string escape sequence to insert a backslash in JavaScript
\
focus
\
document.getElementById("radioButtonId").checked = true; //Could also be false

26. This returns only True or false values
window.location = "New Web Address Here";
var answerVar = confirm("Message Text Here")
confirm()
prompt("Text Here")

27. Statements end in JavaScript with a ________
semicolon ";"
for (counter; condition; incrementor) {}
Objects
(Condition_Expression) ? Value_If_True : Value_If_False;

28. Math object method used to return a given number rounded to the next lowest integer value
Math.floor(number)
toString(base)
toExponential(digits)
toPrecision(precision)

29. String object method used to return the position of the first instance of a specified search string starting from the specified index
<script type="text/javascript">.....</script>
r
v
indexOf(searchValue, startPosition)

30. To alter the value of the text element in a span tag
focus
document.getElementById("spanId").firstChild.nodeValue = "New Value";
\
Two forward slashes "//"

31. String object method used to get the character at a specified index position
v
r
var stringVar = "part 1:" + "part 2";
charAt(position)

32. To code a while statement in JavaScript
Multi line
semicolon ";"
Use a parse. Example : var intVar = parseInt(prompt("Text Here"))
while (condition) {}

33. Date object method used to return a string containing the date and time
<script type="text/javascript">.....</script>
document.getElementById("radioButtonId").checked;
toString()
expression

34. The format to create a new Date object from a string
toFixed(digitCount)
document.getElementById("listId").value;
Underscores
var dateObject = new Date("11/22/2012 18:25:35")

35. A list-like construct that has properties which corresponds to JavaScript values or variables or other objects.
concat(var1, var2, varN)
toString()
Objects
var dateVar = new Date()

36. To set the current checked status of the control for checkboxes
"
toDateString()
v
document.getElementById("CheckboxId").checked = true; //Could also be false

37. To code a for statement in JavaScript
for (counter; condition; incrementor) {}
sensitive
Math.round(number)
confirm()

38. Number object method used to return a numerical string with the specified number of significant digits
document.getElementById("radioButtonId").checked = true; //Could also be false
===
toPrecision(precision)
expression

39. To set the control to be disabled for textboxes
Math.floor(number)
window.onload = function() {//actions here}
document.getElementById("CheckboxId").checked = true; //Could also be false
document.getElementById("TextBoxId").disabled = true;

40. ________ comments start with / and end with /.
t
global
Multi line
Number.NEGATIVE_INFINITY

41. To denote a string in JavaScript
Charset
if (condition) {}
Either single or double quotes surrounding the data
concat(var1, var2, varN)

42. The syntax of a conditional operator
sensitive
document.getElementById("checkboxId").value;
(Condition_Expression) ? Value_If_True : Value_If_False;
\

43. To assign the value from a prompt to a string
document.getElementById("checkboxId").checked;
var dateObject = new Date(year, month, day, hours, minutes, seconds, milliseconds)
var stringVar = prompt("Text Here")
Math.random() //Returns a value >= 0.0 but <1.0

44. When you __________ a javascript variable it retains its original value
ondblclick
n
redeclare
concat(var1, var2, varN)

45. The escape sequence used to insert a Unicode character into a string in JavaScript
udddd
charAt(position)
document.write("Text Here") //Remains on current line
expression

46. The available properties for the Number object: Number.MAX_VALUE - Number.MIN_VALUE - Number.POSITIVE_INFINITY - _______ - Number.NaN
Number.NEGATIVE_INFINITY
udddd
toFixed(digits)
Two forward slashes "//"

47. What Date object method is used to return the number of milliseconds since the start of GMT
Math.floor(number)
var stringVar = prompt("Text Here")
isNaN(varHere) //Returns true or false.
getTime()

48. To get the text value of the control for radio buttons
t
window.onload = function() {//actions here}
document.getElementById("radioButtonId").value;
document.getElementById("ButtonId").onclick = functionName;

49. To view the current web address using JavaScript
udddd
substring(startIndex)
window.location()
document.getElementById("TextBoxId").value;

50. Command to display a prompt
expression
setMilliseconds()
document.getElementById("listId").value;
prompt("Text Here")