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0 vs null vs undefined - explained with toilet paper
(i.stack.imgur.com)
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Image Transcription: Meme
[Four images of toilet roll holders, each with text above them.
The first shows a toilet roll holder holding a partially-used roll of toilet paper. Its text reads, "Non-zero value".
The second shows a holder holding a completely used roll of toilet paper, leaving just the cardboard tube. Its text reads, "0".
The third shows a holder with no toilet roll or cardboard tube on it at all. Its text reads, "null".
The fourth shows no holder; simply plain wall. Its text reads, "undefined".]
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