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Modules are a way to package functionality in units that can depend on other modules. Since modules are often used for code reuse and code organization, knowledge of them is important for all developers.
Events are the basic building block of Node.js. As such, they are important for all Node.js programmers.
Asynchronous programming is a programming method used to to run tasks asynchronously. Running tasks asynchronously can improve performance and allow applications to feel more responsive. As such, it's important for all programmers who need to write performant or responsive applications.
The async function declaration defines an asynchronous function, which can await a response. Using the async-await pattern allows using asynchronous code while not losing readability or maintainability.
When designing and/or analyzing an algorithm or data structure, it is important to consider the performance and structure of an implementation. Algorithmic thinking is one of the key traits of a good programmer, especially one working on complex or performance-critical code.
JSON is an open-standard format that uses human-readable text to transmit data objects consisting of attribute-value pairs. It's the most common data format used for asynchronous browser/server communication.
A stream is a sequence of data elements made available over time. It is particularly useful for tasks that may benefit from being asynchronous, including tasks such as I/O processing or reading from a file, and as such is important for developers to understand.
npm is the default package manager for Node.js. As such, it is an important tool for every Node.js developer.
Everyone makes mistakes. A good programmer should be able to find and fix a bug in their or someone else's code.
In Node.js, all objects that emit events are instances of the EventEmitter class making it one of the most commonly used classes. These objects expose an eventEmitter.on() function that allows one or more functions to be attached to named events emitted by the object.
Exceptions exist in most modern programming languages, making it important for a programmer to understand them and know how to handle them.
A dictionary (or associative array) is a data type composed of a collection of key-value pairs, where each possible key appears at most once in the collection. It is used when we need to access items by their keys.
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