Learn JavaScript

Spaces, tabs and newlines used outside of string constants are called whitespace and, unlike other programs this whitespace can directly impact semantics.

A technique called "automatic semicolon insertion" (ASI), some statements that are well formed when a newline is parsed will be considered complete (as if a semicolon were inserted just prior to the newline)

Statement-terminating semicolons may lessen unintended effects of the ASI.

5 characters are commonly problematic. The open parenthesis "(", the open bracket "[", the slash "/", the plus "+" and the minus "-"

A semicolon as the first character. Also known as the defensive semicolon or the initial semicolon.

How do you declare a single line comment?

With a slash star, ending with a star slash: /** hello **/

A scripting language is a lightweight programming language that is utilized as a code that is inserted into HTML pages.

True or False, when a form is submitted by calling the submit function via JavaScript, the submit event is fired.

External scripts should end with .js and is called within the script tag using the src attribute.

What is the purpose of a semicolon?

A block is a group of statements whose purpose is used to execute together.

A block begins with a left curly bracket and ends with a right curly bracket.

You can break up a text string with a backslash. The example below will be displayed properly:

Variable values are called _______

variables: 2 steps to use a var

variables: declare & initialize in single statement

var v1, v2 = 'hello', v4 = 4, v5;

var case_matters = 'lower';

What tag is used to embed JS code into HTML?

php naming convention is _______

three basic data types in js

var sum = 4 + 5;

Adds two values together or concatenates two strings into a single string.

Parse a string to base 10 value

are the _______ parameter of parseInt function

not a number - is returned if parseInt encounters a character which is not a number. For example,

Create a function that ha a parameter. The function should return 5times the parameter value.

Give an example of anonymous function

Assign a function to a variable

Functions are values

var firstIndexOfIs = obj.indexOf("is");

Search from right to left

_______ methods returns a new string after modifying the existing string

Object is _______ in js

Data types in js begin with _______ case letter

An HTML element in the DOM>

pascal casing

this variable refers to an _______

var person =

to logically organize complex data

var myArray = new Array(11, "hello", true);

Find size of an array

insert an item in an array

var array1 = ["apple","ball", "cat"],

Separate each element of an array using comma

reverses the items in an array

The sort() method sorts the elements of an array in place and returns the array. The sort is not necessarily stable. The default sort order is according to string Unicode code points.

At the top of the hierarchy of objects we have _______ object

_______ prevents code collison, if you are using third party plugins/js code this is very useful.

location is property of window object

take user to github.com if a user clicks on yes button

Nodelist, it does not return an array

find all p tags inside div

createElement only create an element, it does not add it to a _______

add p element to the end of body tag

Delay the execution of a function by 2 seconds

Display something using javascript

Save our code from the browser that does not support javascript

To show content to those browsers with JS turned off, the _______ tag is used

When a user clicks on a button display message. Create a function in javascript.

Numbers eg. 123, 120.50 etc.

javascript does not separate integer value and floating point value. All numerical values are floating point values in javascript

Reserved keyword that cannot be used for naming variables

_______ is used to assign values to variables

var input = parseInt(5);

Conditional operator ? : is also called _______ operator.

_______ operator can be used to find the type of a data.

web browser's object

keyword

when A page loads

HTML Button to print

the capability to store related information, whether data or methods, together in an object

the capability to store one object inside of another object

the capability of a class to rely upon another class (or number of classes) for some of its properties and methods

the capability to write one function or method that works in a variety of different ways

Get title of your html document

Uppercase and lowercase characters are not the same.

How to declare a variable?

var Array = ["John", 24, true];

How to write comments in JavaScript?

... == ... [without the type]

... != ... [without the type]

False

How to link your script to HTML?

An application generally created as a relatively small object, usually small and targeted in scope and purpose, that can run online and on computers, handhelds, and cell phones.

An HTML enhancement that describes how Web pages should look. Used to efficiently bring unity and similar styles to Web pages.

An HTML page, or HTML document, is any document created in HTML that can be displayed on the World Wide Web.

Tags created within Web documents that give instructions to a Web browser. These instructions determine the look and feel of a Web document on the Internet.

The first Web browser that allowed pictures and sound to accompany text on a Web page. Mosaic was created in 1992 at the University of Illinois.

One of two major Web browsers used on the Internet today. Navigator, created in 1994, added to the powerful features of Mosaic, allowing additional features like animated graphics into a Web document.

An introduction page when you visit a Web site. A welcome page often includes the Web page owners? e-mail address and name.

What is the command to display a prompt?

How do you assign the value from a prompt to a string?

How do you assign the value from a prompt to a non-string variable?

How do you display an alert?

How do you test that a variable contains a valid number?

How do you display a confirmation?

What values can confirm() return?

How do you assign the return value of confirm() to a variable?

How do you access a page element by id?

How do you assign actions to the window onLoad event?