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doc: document `!in` (#8546)

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Ruofan XU 2021-02-05 23:45:20 +08:00 committed by GitHub
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@ -1046,15 +1046,18 @@ match mut x {
### In operator ### In operator
`in` allows to check whether an array or a map contains an element. `in` allows to check whether an array or a map contains an element.
To do the opposite, use `!in`.
```v ```v
nums := [1, 2, 3] nums := [1, 2, 3]
println(1 in nums) // true println(1 in nums) // true
println(4 !in nums) // true
m := { m := {
'one': 1 'one': 1
'two': 2 'two': 2
} }
println('one' in m) // true println('one' in m) // true
println('three' !in m) // true
``` ```
It's also useful for writing boolean expressions that are clearer and more compact: It's also useful for writing boolean expressions that are clearer and more compact: