isNaN
Platform and version requirements: JVM (1.0), JS (1.0), Native (1.0)
fun Double.isNaN(): Boolean
fun Float.isNaN(): Boolean
Returns true if the specified number is a Not-a-Number (NaN) value, false otherwise.
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Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/is-na-n.html
