Have you ever used
|| to set a default value if a variable was null or undefined?
For example, like this:
const myColor = color || 'red'
Well, nullish coalescing is going to replace
|| in there:
const myColor = color ?? 'red'
Why is this operator useful?
Well, there is a whole range of bugs that hide underneath the surface when using
|| to provide a fallback value.
|| handles values as falsy.
?? handles values as nullish (hence the name).
Which means that with
|| the second operand is evaluated if the first operand is
?? on the other hand limits this list to only
THE VALLEY OF CODE
THE WEB DEVELOPER's MANUAL
You might be interested in those things I do:
- Learn to code in THE VALLEY OF CODE, your your web development manual
- Find a ton of Web Development projects to learn modern tech stacks in practice in THE VALLEY OF CODE PRO
- I wrote 16 books for beginner software developers, DOWNLOAD THEM NOW
- Every year I organize a hands-on cohort course coding BOOTCAMP to teach you how to build a complex, modern Web Application in practice (next edition February-March-April-May 2024)
- Learn how to start a solopreneur business on the Internet with SOLO LAB (next edition in 2024)
- Find me on X