What are promises in JavaScript? In which states can a promise be?
JavaScript's promises represent the eventual completion (or failure) of asynchronous operations and their resulting value.
JavaScript Function Snippets
The JavaScript snippet collection contains a wide variety of ES6 helper functions. It includes helpers for dealing with primitives, arrays and objects, as well as algorithms, DOM manipulation functions and Node.js utilities.
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JavaScript · Create a unit converter data structure in JavaScript
Learn how to create a unit converter data structure in JavaScript that can convert between any compatible units.
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JavaScript · Debounce a JavaScript function and return a promise
Easily create a debounced function that returns a promise.
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JavaScript · What does 'use strict' do and what are some of the key benefits to using it?
JavaScript's strict mode can make your code faster, cleaner and more secure.
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JavaScript · Function composition in JavaScript
Understand the basics of function composition, a fundamental concept in functional programming.
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JavaScript · How can I create a JavaScript generator function that repeats one or more values indefinitely?
Learn how to create a generator function that repeats a given value or an array of values indefinitely.
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JavaScript · Date range generator in JavaScript
Create a generator that generates all dates in a given range.
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JavaScript · What are JavaScript closures?
Learn and understand closures, a core concept in JavaScript programming, and level up your code.
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JavaScript · What is the difference between static and instance methods?
Static and instance methods are pretty easy to distinguish and serve different purposes. Learn all about them in this article.
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JavaScript · Debounce a JavaScript function
Create a debounced function that waits a certain amount of time before invoking the provided function again.
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JavaScript · Call a JavaScript function once
Create a function that ensures another function is called only once.
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JavaScript · Understanding the spread and rest syntax in Javascript
JavaScript ES6 introduced us to powerful new features, such as the spread and rest syntax. Learn all you need to know in this quick guide.
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JavaScript · What is the difference between synchronous and asynchronous code in JavaScript?
Understanding the differences between synchronous and asynchronous code is a crucial piece of knowledge for every web developer.
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JavaScript · Using random values with pure functions
Randomness and pure functions don't seem to go hand in hand. But where there's a will, there's a way.
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JavaScript · Make a JavaScript function return a promise
Learn how to convert an asynchronous function to return a promise in JavaScript.
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JavaScript · What is the difference between then and finally in a JavaScript promise?
A JavaScript promise's
thenandfinallymethods seem very similar. But there are a few important differences you need to keep in mind. -
JavaScript · What is a pure function?
Pure functions are a very important concept to know, especially if you're interested in functional programming.
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JavaScript · An introduction to functional programming
A short introduction to the functional programming paradigm.
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JavaScript · What does a JavaScript constructor return?
The constructor is a crucial part of any JavaScript class, which is why you might want to take a closer look at what they return.
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JavaScript · Create a JavaScript promise that resolves after a given amount of time
Learn how to create a promise that resolves after a given amount of time in JavaScript.
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JavaScript · What is recursion and when is it useful?
Recursion is a very important programming concept all developers should be familiar with.
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JavaScript · The order of then and catch matters
Messing up the order of chained
thenandcatchmethods in JavaScript promises can cause problems. Here's a short primer on the subject. -
JavaScript · Is JavaScript pass-by-value or pass-by-reference?
How JavaScript handles passing data is a source of confusion and bugs for many developers, especially when it comes to object types.
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JavaScript · How can I partially apply a function in JavaScript?
Learn how to leverage partial application to improve the reusability of your JavaScript functions.