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.
Stream is writable
Checks if the given argument is a writable stream.
JavaScript, Node.js · Oct 20, 2020
What are the differences between var, let and const in JavaScript?
JavaScript variables can be declared a handful of ways. However, understanding their differences can drastically change the way you code.
JavaScript, Type · Dec 2, 2021
Stream is readable
Checks if the given argument is a readable stream.
JavaScript, Node.js · Oct 20, 2020
Convert a string to a boolean
Have you ever tried to convert the string representation of a boolean to an actual boolean value? Here's a simple way to do it.
JavaScript, String · Sep 14, 2022
Value is async function
Checks if the given argument is an
asyncfunction.JavaScript, Type · Oct 20, 2020
Value is generator function
Checks if the given argument is a generator function.
JavaScript, Type · Oct 20, 2020
Understanding JavaScript variables and scopes
JavaScript developers often get confused by JavaScript's variables and scope. Here's a quick guide to understanding these concepts.
JavaScript, Type · Jun 12, 2021
Value is plain object
Checks if the provided value is an object created by the Object constructor.
JavaScript, Type · Oct 20, 2020
What does the double negation operator do in JavaScript?
You've probably come across the double negation operator (
!!) before, but do you know what it does?JavaScript, Type · Jul 26, 2022
What's the difference between undeclared, undefined and null in JavaScript?
JavaScript has three different empty states for variables. Learn their differences and how you can check for each one.
JavaScript, Type · Jun 12, 2021
What is the difference between JavaScript's equality operators?
Learn all you need to know about the differences between JavaScript's double equals and triple equals operators.
JavaScript, Type · Jun 12, 2021
Argument coalescing factory
Customizes a coalesce function that returns the first argument which is
truebased on the given validator.JavaScript, Function · Oct 22, 2020
JavaScript's numeric separators explained
Numeric separators are a somewhat lesser-known JavaScript syntactic sugar that can make working with large constants a lot easier.
JavaScript, Math · Jun 27, 2021