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compareTo

fun String.compareTo(
    other: String, 
    ignoreCase: Boolean = false
): Int

Platform and version requirements: JVM

Compares two strings lexicographically, optionally ignoring case differences.

© 2010–2017 JetBrains s.r.o.
Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.text/compare-to.html