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Array(s):

An array is a collection of data that is associated with a single variable name. Each piece of data is considered a value and is indexed numerically within the array.

Comment(s):

Comments are often used by programmers as a means of documenting their program logic so that when they return to update it, or someone else needs to edit it, they can understand what the programmer was doing at the time

Delimiter(s):

These are the brackets, quotations etc. that surround pieces of code. Examples of delimiters are " ", { }, ( ), [ ]. A start delimiter such as ( must be accompanied by a closing delimiter such as ).

Event(s):

These are the ‘triggers’ that initiate (start) one of your functions. Client-Side JavaScript will not run unless it is ‘called on’ by an event. Examples of events can include, clicking on a form’s submit button or moving your cursor over an image that is a hyperlink.

Expressions:

Expressions are a set of statements that, as a group, evaluate to a single value. JavaScript then categorizes this resulting value as one of the five data types: number, string, logical, function, or object.

Function(s):

Functions are an important part of programming as they enable you to create chunks of code that perform specific tasks. In JavaScript, functions are referred to as ‘subroutines’ or ‘procedures.’ JavaScript has several built-in functions, but you can also create your own functions for your programs.

Global Variable(s):

These are variables that are available to all functions. Global variables should be used with caution, as it’s easy to assign the wrong value to a global variable.

Literals:

Literals are data comprised of numbers or strings used to represent fixed values in JavaScript. They are values that do not change during the execution of your scripts.

Local Variable(s):

These are variables that are only available within a specific function’s braces.

Method(s):

A method is a function that has been encapsulated in an object.

Object(s):

An object is a collection of variables and functions. JavaScript has four built-in objects including String, Date, Math and Array.

Operator(s):

These are the things that act on variables. There are three types of operators used in the JavaScript language: Computational, Logical and Bitwise. Computational operators perform mathematical tasks such as addition, subtraction, multiplication etc. and are the most commonly used. Logical operators are often used in condition statements like "if" and "switch statements. Bitwise operators work with bits and bytes (or 1s and 0s) and are rarely used.

Statement(s):

A statement is a complete line of JavaScript code.

Syntax:

A set of rules and guidelines used for writing in any language. Each programming language has its own set of rules and conventions. If you do not comply with the language’s syntax, your programs or scripts will not work correctly – if at all.

Variable(s):

A variable is a name assigned to a location in a computer’s memory to store data. Variables must be declared in your programs and can be identified by the fact that they are proceeded by the keyword ‘var’. JavaScript, unlike other programming languages, can hold different data types as variables without declaring the type.