Javascript

Front 1

What is closure?

Back 1

A closure is something that retains its scope and state. Basically, it's a function that has a reference to a private variable.

Front 2

What is HTML?

Back 2

Hypertext Markup Language

Front 3

What are tags?

Back 3

Elements like < img > and < span >

Front 4

What is Doctype?

Back 4

Doctype defines what version of HTML will be used

Front 5

How do you check HTML for errors?

Back 5

Using HTML validators, W3C provides one.

Front 6

What is semantic HTML?

Back 6

Semantic HTML means the tags have meaning in regards to what they do, ie < nav > < footer >

Front 7

New HTML5 elements?

Back 7

< audio > < video > < nav > < article >

Front 8

What is HTTP

Back 8

Hypertext transport protocol

Front 9

Basic format for a webpage?

Back 9

!DOCTYPE

< head >

< / head >

< body >

< / body>

Front 10

What is CSS?

Back 10

Cascading Style Sheets

Front 11

What does cascading in CSS refer to?

Back 11

This means starting with the most specific element, ie going from most specific styling to most general.

Front 12

What is a contextual selector in CSS?

Back 12

Something like: div div article h1

Front 13

What is a pseudo class?

Back 13

It allows you to identify elements by their characteristics (sub parts of elements), ie a:hover, a:link, p.first-child

Front 14

Difference between visibility:hidden and display:none?

Back 14

Visibility:hidden hides the item, but it still occupies the space, display:none completely removes it.

Front 15

What are JavaScript types? (7)

Back 15

Number, string, boolean, function, object, null, undefined

Front 16

How do you convert numbers between different bases in JavaScript?

Back 16

Use the parseInt() function

Front 17

What boolean operators does JavaScript support? (2)

Back 17

&& and !

Front 18

How do you get the contents of an input box in JavaScript?

Back 18

document.getElementById('id').value

Front 19

How do you determine the state of a checkbox in JavaScript?

Back 19

document.getElementById('id').checked

Front 20

What looping structures are there in JavaScript? (3)

Back 20

For, while, and do-while

Front 21

How do you create a new object in JavaScript?

Back 21

var obj = {}

Front 22

How do you hide JavaScript from old browsers that don't run it?

Back 22

Use < NOSCRIPT > < / NOSCRIPT >

The HTML between those tags will what is displayed on browsers that don't support js

Front 23

How do you assign an object properties in JavaScript?

Back 23

obj.age = 23;

Front 24

What is the difference between undefined value and null value in JavaScript?

Back 24

(i) Undefined means a variable has been declared but has not yet been assigned a value

(ii) Null is an assignment value that can be given to vars

Front 25

How to create a confirmation box in JavaScript?

Back 25

confirm("Confirm This");

Front 26

How do you generate a random number in JavaScript?

Back 26

Math.random()

Generates a random decimal between 0 and 1

Front 27

What is OOP?

Back 27

Object-Oriented Programming

1. Abstraction

2. Inheritance

3. Encapsulation

Objects are the focus, and have various properties