Boolean traps can cause readabiltiy and maintainability issues in your code. Learn what they are, how to spot and fix them in this article.

JavaScript's built-in Boolean function can be very useful for truth-checking data among other things. Learn how to use it and level up your code today.

JavaScript uses type coercion in Boolean contexts, resulting in truthy or falsy values. Get a hang of how it all works in this quick guide.

Performs a deep comparison between two values to determine if they are equivalent.

One of the most commonly asked JavaScript interview questions is about hoisting. It's also a concept that might require some getting used to, so read our guide to learn more.

Checks if the given argument is a duplex (readable and writable) stream.

Checks if the given argument is a writable stream.

JavaScript ES2020 introduced optional chaining and nullish coalescing among other features. Learn everything you need to know with this quick guide.

Checks if the a value is an empty object/collection, has no enumerable properties or is any type that is not considered a collection.

Checks if an object looks like a Promise.

Checks if the given argument is a readable stream.

JavaScript variables can be declared a handful of ways. However, they're not all created equal and understanding their differences can drastically change the way you code.

Checks if the given argument is an async function.

Checks if the given argument is a generator function.

JavaScript's instanceof operator can't be used with primitive values, but there are a couple of simple tricks that you can leverage to your advantage.