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isSurrogate

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

Returns true if this character is a Unicode surrogate code unit.

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