null & undefined Explained | FullStack Masterclass JavaScript Course
A focused JavaScript lesson about null & undefined, with examples, common mistakes, self-checks and practical browser context.
In this FullStack Masterclass lesson, Andrew explains null & undefined as part of the Values & Types chapter.
You will learn:
Explain what null & undefined does in JavaScript.
Read a strong null & undefined code pattern.
Recognize a weak null & undefined pattern before using it in production.
Practice null & undefined in a small browser-focused exercise.
Chapters:
00:00 null & undefined
00:16 What You Will Learn
00:30 null and undefined both mean absence, but not the same kind of absence.
00:59 Core Ideas
01:21 Clear empty state with nullish fallback
01:40 Using || when valid falsy values matter
01:53 Production Rules
02:23 Use nullish coalescing correctly
02:38 Self-check
02:57 Keep Building
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