Understanding Document Object Model (DOM)
The DOM is also used to create dynamic webpages, where the content of the page can be changed without reloading the page. This is done by manipulating the DOM tree and adding or removing elements from the page. Additionally, the DOM can be used to detect user interactions with the page, such as mouse clicks or key presses, and respond to them accordingly.
Working with Events and Event Handlers
Events are actions taken by the user—such as clicking on a link or pressing a key—that trigger specific actions within the application itself. Event handlers are functions triggered by those events and designed to act on them. For instance, when you click on an element in a web page, an event handler for that element will be triggered and execute the code written in that handler. This allows developers to create interactive elements on user interfaces/web pages.
Working with Data Types and Variables
Data types define the types of values which can be stored within variables. Variables are containers that store data which can be accessed in the program. They can be made up of different data types such as strings (text), numbers, Booleans (true/false values), objects and arrays (a list of multiple values). These are all used in web development to store data required by the application.
Understanding Operators and Control Structures
Operators are used to perform mathematical or logical operations—such as addition or comparison—on variables. Control structures are lines of code that dictate how an application should proceed in certain conditions—for example if statements that control whether a specific block of code should be executed or skipped. They are both essential components of programming in any language.
Best Practices for Writing Clean, Maintainable Code
Writing clean code is important to ensure that your program works as expected while being easy to maintain in the long term. Best practices include defining variables with clear descriptors, breaking down lengthy functions into smaller chunks, following consistent coding formats, commenting code and strive for readability.