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*View this file with results and syntax highlighting [here](https://mlochbaum.github.io/BQN/help/nothing.html).*
# Middle Dot (`·`)
## `·`: Nothing
[→full documentation](../doc/expression.md#nothing)
Indicates no value. If a left argument is Nothing, the function is called with no left argument, and if the right is Nothing, it's not called and "returns" Nothing.
· ⌽ "abc" # Reverse instead of Rotate
### In Trains
[→full documentation](../doc/train.md#2-train-3-train)
Nothing can serve as a left argument in a train to string together multiple monadic functions.
(-+-) 5
(-·+-) 5
### Destructuring
[→full documentation](../doc/expression.md#destructuring)
For pattern matching in assignment or a block header, Nothing indicates an unused value.
F ← {𝕊 a‿·‿b: a∾b}
F 1‿2‿3
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