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kotlinlang

Hi everyone, can someone help me out with what this symbols !! means, please? :slightly_smiling_face:

For instance:

```private fun &lt;T&gt; buildBody(parameters: T) =
        jacksonObjectMapper()
            .convertValue&lt;Map&lt;String, String&gt;&gt;(parameters!!)
            .let {
                LinkedMultiValueMap&lt;String, String&gt;().apply {
                    setAll(it)
                }
            }```

it is a not-null assertion operator:
<https://kotlinlang.org/docs/null-safety.html#the-operator>

oh thank you Luke, will see there :slightly_smiling_face:

If you know `parameters` cannot be null (it will throw when it is, using the `!!`) You can use `&lt;T: Any&gt;` to enforce it at compile time and avoid the need to use `!!`

Ey Phil thanks it's interesting, I'm just did that change, thank so much!