The plain-English version
In JavaScript, null commonly marks an intentional absence; undefined commonly means a value has not been supplied or assigned.
Why it matters
Missing values need an explicit rule before they reach calculations, forms, or storage.
Let’s make it click
A task with no due date might store dueDate: null and show "No due date" in the interface.
Vibe Bro’s heads-up
Treating a missing date as today's date can incorrectly make undated tasks appear overdue.
The docs behind it
Documentation links checked .
Editorial review · October 28, 2026
Supported: Read the full explanation, examples, and pitfalls; no material factual error identified. References are supporting reading, not a sentence-by-sentence source concordance.