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What is `null`?

There have been many value types we've discussed; integers, strings, etc. there is another type we should mention.

This is the null value which means the absence of a value. Normally we don't directly write the null value when programming but it is sometimes returned by methods we use in order to indicate the lack of a result.

Key point: null represents the lack of a value.

null versus zero

null-vs-zero

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