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

# getting-started

[Daniel Felipe Henao Toro]

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

For instance:

private fun <T> buildBody(parameters: T) =
        jacksonObjectMapper()
            .convertValue<Map<String, String>>(parameters!!)
            .let {
                LinkedMultiValueMap<String, String>().apply {
                    setAll(it)
                }
            }

[Luke Armitage]

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

[Daniel Felipe Henao Toro]

oh thank you Luke, will see there 🙂

[phldavies]

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

[Daniel Felipe Henao Toro]

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