ISA Lecture Week 5: Asynchronous JavaScript

JSON is a data format that uses a text-based syntax similar to JavaScript object literals.

JSON data consists of key-value pairs, where the keys are enclosed in double quotes and the values can be strings, numbers, booleans, arrays, or even other objects.

Curly braces {} are used to enclose JSON objects, which represent a collection of key-value pairs.

Square brackets [] are used to enclose JSON arrays, which are ordered lists of values.

JSON.parse() converts a JSON string into a JavaScript object.

JSON.stringify() converts a JavaScript object into a JSON string.

JSON data is commonly used for data exchange between different systems and applications due to its simplicity and readability.

An object representing an asynchronous operation, signaling completion with a result or an error.

JSON data is independent of programming languages and can be easily parsed and interpreted by different applications.

A special method used to handle the successful outcome of a promise. It's executed when the promise is resolved successfully.

A special method used to handle errors that occur during the execution of a promise.

It is a promise-based API to fetch resources from a server. It's a more modern and user-friendly alternative to the older XMLHttpRequest (XHR).

The core function of the Fetch API. It takes a URL as an argument to make an HTTP request to the server. It always returns a promise.

An object representing the response returned from the server after a request.

A method of the Response object that converts the response content into a JavaScript object.

A numeric code indicating the success or failure of an HTTP request.

A standard way for applications to talk to each other, like a language they both understand. It defines how data is sent and received.

A specific type of API designed for use on the web, allowing websites and applications to interact with each other.

A set of built-in tools that expand the capabilities of web browsers, enabling them to access system features and data.

A set of tools that extend the capabilities of web servers, enabling them to handle requests and provide data.

APIs that are not built into your browser. They need to be downloaded and used separately.

A specific type of response code used in web communication, indicating a successful request.

A specific type of response code used in web communication, indicating that the requested resource cannot be found.

A function that is executed after another function has finished executing. It's used to handle results or errors after asynchronous operations.

A function that is defined and used within the code where it's created. It's not stored separately in memory, making it a convenient way to write concise code.

A situation arising from nesting multiple callback functions within each other, leading to deeply indented code, making it difficult to read and maintain. It often occurs with asynchronous operations like network requests.

A function that performs an operation that doesn't complete immediately. It typically involves waiting for external factors like network requests, user input, or timing delays.

A mechanism in JavaScript to handle the result of an asynchronous operation. It acts as a placeholder for the function to be executed once the operation completes, receiving the results or any errors encountered.

A function that is explicitly named and defined in a program, unlike anonymous functions. It can be reused across different parts of the code.

The ability to chain asynchronous operations, performing one operation after another based on the results of previous ones, helping to manage the flow of requests and responses.

It's used to delay execution of JavaScript code for a specified time. The code executes after the specified delay.

A built-in browser function that delays the execution of code. It's often used for asynchronous tasks like handling time-based events or creating animations.

JavaScript is a single-threaded language, meaning it can only execute one piece of code at a time. This can lead to the main thread being blocked by long-running tasks.

Asynchronous programming allows code to run without blocking the main thread. This is crucial for handling long-running operations such as network requests or complex calculations.

A JavaScript object that represents a promise for a future value. It can either resolve with a successful value or reject with an error message. These are more efficient and easier to manage compared to callbacks.