JavaScript Type 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.
Boolean traps and how to avoid them
Boolean traps can cause readability and maintainability issues in your code. Learn what they are, how to spot and fix them in this article.
JavaScript, Function · Jul 11, 2021
How can I check for a blank value in JavaScript?
JavaScript doesn't have a built-in way to check if a value is blank, but it's easy to create one.
JavaScript, Type · Sep 25, 2022
Where and how can I use the Boolean function in JavaScript?
JavaScript's Boolean function can be used for truth-checking data among other things. Learn how to use it and level up your code today.
JavaScript, Function · Jun 12, 2021
Check if value is of type
Checks if the provided value is of the specified type.
JavaScript, Type · Oct 20, 2020
What are truthy and falsy values in JavaScript?
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.
JavaScript, Type · Sep 12, 2021
Typechecking objects with Proxy in JavaScript
Learn how to type check objects at runtime using the powerful Proxy object in JavaScript.
JavaScript, Object · Apr 23, 2023
Check object equality
Performs a deep comparison between two values to determine if they are equivalent.
JavaScript, Object · Oct 13, 2021
What is hoisting in JavaScript?
Hoisting comes up a lot during JavaScript interviews. It's a concept that may require some getting used to, so read our guide to learn more.
JavaScript, Type · Jun 12, 2021
How can I use optional chaining and nullish coalescing in my JavaScript project?
JavaScript ES2020 introduced optional chaining and nullish coalescing. Learn everything you need to know with this quick guide.
JavaScript, Type · Jun 12, 2021
Collection is empty
Checks if the a value is an empty object/collection, has no enumerable properties or is any type that is not considered a collection.
JavaScript, Type · Oct 20, 2020
Is there a way to use instanceof for primitive JavaScript values?
JavaScript's
instanceofoperator can't be used with primitive values, but there are a some tricks that you can leverage to your advantage.JavaScript, Type · Jun 12, 2021
Tip: Typechecking arrays with Array.isArray()
Make sure to use the correct method when checking if a JavaScript object is an array.
JavaScript, Type · Nov 6, 2022
Value is array-like
Checks if the provided argument is array-like (i.e. is iterable).
JavaScript, Type · Oct 20, 2020
Stream is duplex
Checks if the given argument is a duplex (readable and writable) stream.
JavaScript, Node · Oct 20, 2020
