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max

kotlin-stdlib / kotlin.text / max
Platform and version requirements: JVM (1.0), JS (1.0), Native (1.0) 
fun CharSequence.max(): Char?

Returns the largest character or null if there are no characters.

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Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.text/max.html