2.1. JavaScript PreTest¶

The following Quiz is for me to assess what you already know about JavaScript. It will not count towards you final grade, nor will I look down on you if you don’t know any of it. The point is to not waste time covering things that people already know. It will also provide a basis at the end to measure how much you have learned!

pretest-1: Inside which HTML element do we put the JavaScript?

<javascript>
<js>
<scripting>
<script>

pretest-2: What is the correct JavaScript syntax to change the content of the HTML element below?

<p id="demo">This is a demonstration.</p>

document.getElementById("demo").innerHTML = "Hello World!";
#demo.innerHTML = "Hello World!";
document.getElementByName("p").innerHTML = "Hello World!";
document.getElement("p").innerHTML = "Hello World!";

pretest-3: The external JavaScript file must contain the <script> tag.

True
False

pretest-4: How do you create a function in JavaScript?

function:myFunction()
function myFunction()
function = myFunction()

pretest-5: How do you call a function named “myFunction”?

call function myFunction()
myFunction()
call myFunction()

pretest-6: How to write an IF statement in JavaScript?

if (i == 5)
if i = 5 then
if i = 5:
if i == 5 then

pretest-7: How does a WHILE loop start?

while i = 1 to 10
while (i <= 10; i++)
while (i <= 10)

pretest-8: How does a FOR loop start?

for (i = 0; i <= 5)
for (i = 0; i <= 5; i++)
for i = 1 to 5
for (i <= 5; i++)

pretest-9: What is the correct way to write a JavaScript array?

var colors = 1 = ("red"), 2 = ("green"), 3 = ("blue")
var colors = (1:"red", 2:"green", 3:"blue")
var colors = ["red", "green", "blue"]
var colors = "red", "green", "blue"

pretest-10: JavaScript is the same as Java.

True
False

pretest-11: Which event occurs when the user clicks on an HTML element?

onchange
onmouseover
onclick
onmouseclick

pretest-12: How do you declare a JavaScript variable?

v carName;
var carName;
variable carName;

pretest-13: What is the output of the following?

l = ['a', 'b', 'c']
for (var i of l) {
    console.log(i)
}

It is an error
'a', 'b', 'c' - each on their own line
1, 2, 3 - each on their own line
0, 1, 2 - each on their own line

pretest-14: What is the output of the following?

l = ['a', 'b', 'c']
for (var i in l) {
    console.log(i)
}

It is an error
'a', 'b', 'c' - each on their own line
1, 2, 3 - each on their own line
0, 1, 2 - each on their own line

Write a function called isEven that takes a single number as a parameter and returns true if the number is even. Otherwise it should return false.

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