###JavaScript (or JS)
It is a popular programming language commonly used to create interactive effects within web browsers.
###variable
A place to store values, can store any kind of information (data types): numbers, words, collections of data
###undefined variable
A variable that has no value
###to declare variable
To create a variable - done by using ‘ var variable-name = value ’
###to initialize variable
Set (give) some value to variable.
###string
A set of characters, word(s), phrase. To initialize variable with a string you need to put this string into quotes.
###boolean
Boolean variable represent a logical value True or False
###array
An ordered list of values, can store different types of data inside
###operator
Mathematical operators, such as: +, -, *, /, >, <, = etc
###comments
Comments are some notes that you can leave for yourself or another person, a note that a computer will not read. You can write a comment on a new line or on the same line after code as so: //I’m your comment Single line comment starts with // Multi line comment are placed between /* .. */
###function
A separable, reusable piece of code. It takes some input, does some manipulation on it and returns us an output.
###to declare function
To create a function
###argument
A value input that functions can accept
###if/else statement
‘If’ used to decide which lines of code to execute, ‘else’ - to give alternative set of instructions. Example: if(x > 5) {console.log”X bigger than 5”}; else {console.log”X smaller than 5”};
###while loop
It repeats code over and over again until some condition is met.
###for loop
This loop is similar to ‘while loop’, just with a set amount of repetition. You declare counter in the statement as so: for(var i = 0; i < 5; i++){do something 5 times};
###infinite loop
A loop that does not stop and it’s a loop that you need to avoid. Each loop should have some condition so it can stop.
###object
A collection of properties
###event
A type of object that is created when a user interacts with a web page. For example, JavaScript creates an event when a user clicks on a button.
###CSS
Stands for Cascading Style Sheets. CSS describes how HTML elements are to be displayed on screen. It is presentation.
###HTML
Stands for Hyper Text Markup Language. It is a structure of the elements on the page.
###DOM
Stands for Document Object Model. It defines the logical structure of documents and the way a document is accessed and manipulated.
###scope
Scope is the set of variables, objects, and functions that you can access.
###console
A method of interacting with the system. In order to write to the browser console, you could use console.log(‘Hello World’). This would write Hello World in the browser console.