get operator for YamlMap

[Vampire]

I'd like to suggest a get operator for YamlMap.
It proved useful for me, so you might want to add this to the YamlMap.

operator fun <T : YamlNode> YamlMap.get(key: String) =
    entries
        .asSequence()
        .find { (it.key as? YamlScalar)?.content == key }
        ?.value as T?

It enables things like:

val runsMaybe: YamlMap? = yamlMap["runs"]
val runs: YamlMap = yamlMap["runs"]!!
val using = yamlMap.get<YamlMap>("runs")!!.get<YamlScalar>("using")!!.content

[Vampire]

And this here is also handy if you need to get the key for a map entry:

fun YamlMap.getKey(value: YamlNode) =
    entries
        .asSequence()
        .find { it.value == value }
        ?.key
        ?.let { it as? YamlScalar }
        ?.content

[charleskorn]

Hey @Vampire, makes sense to me, thanks for the feedback.

[Vampire]

Hi there, did you not like the second one, or just overlooked it?
In the current version it would be

fun YamlMap.getKey(value: YamlNode) =
    entries
        .asSequence()
        .find { it.value == value }
        ?.key
        ?.content

[charleskorn]

@Vampire I'm not keen to add a getKey method as it seems like an unusual use case with a simple-enough alternative for those that really need it.