compareTo
 Platform and version requirements: JVM (1.0), JS (1.2) 
fun String.compareTo( other: String, ignoreCase: Boolean = false ): Int
 Platform and version requirements: Native (1.3) 
fun String.compareTo(other: String, ignoreCase: Boolean): Int
Compares two strings lexicographically, optionally ignoring case differences.
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Licensed under the Apache License, Version 2.0.
    https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.text/compare-to.html