Understanding Variables, Data Types, and Operators
Comparison operators are used to compare two values and return a boolean value of either true or false. Logical operators are used to combine multiple comparison operators and return a single boolean value. By using these operators, we can create complex expressions that can be used to control the flow of our code.
Working with Strings and Arrays
We can also use arrays to store multiple values in a single variable. Arrays are created using square brackets, and items within them are separated by commas. Array elements can be accessed either directly or by looping through them with for loops.
Arrays can also be used to store objects, which can be useful for organizing data. Objects are created using curly brackets, and each object can contain multiple properties and values. Objects can be accessed directly or by looping through them with for-in loops.
We can use loops to iterate through pieces of code a number of times. The most common loop is the for loop, which consists of an initializing expression, a termination expression, and an increment expression. We also have while loops that run while a condition is met.
For code to be executed based on different conditions, we use conditionals. These use comparison operators to compare two values and execute different code when certain conditions are met. If statements are used to evaluate whether given conditions are true or false, while switch statements can execute different blocks of code based on certain cases.
In addition to if and switch statements, we can also use ternary operators to evaluate conditions. These are a shorthand way of writing if statements, and can be used to assign values to variables based on certain conditions. They are a great way to make code more concise and readable.
Understanding the Document Object Model (DOM)
The DOM is an essential part of web development, as it allows developers to create dynamic webpages that can respond to user input. It also allows developers to create interactive webpages that can be used to create games, applications, and more. By understanding the DOM, developers can create powerful and engaging webpages that can be used to create a great user experience.
Using the DOM, we can access any element on the page. We can use different methods like querySelector() to get an element and find(), getElementsByClassName(), or getElementsByTagname() methods to get multiple elements that match specific criteria. We can also modify them using methods like setAttribute() to change their attributes or innerHTML property to change their content.
Events are actions that take place on a page, such as when a user interacts with something. We can listen for events on our page with the addEventListener() method. This method takes two arguments: the event name and a callback function that will be executed whenever that event is triggered.
Adding Interactivity with jQuery
Working with AJAX Requests
Modularizing Code with Modules
Modules are pieces of code that can be imported from other files. They are commonly used for organizing large projects as they allow code to be reused across multiple files. Modules use the import and export keywords for sharing code with other modules.