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isNotBlank

Platform and version requirements: JVM (1.0), JS (1.0), Native (1.0)
fun CharSequence.isNotBlank(): Boolean

Returns true if this char sequence is not empty and contains some characters except of whitespace characters.

import kotlin.test.*

fun main(args: Array<String>) {
//sampleStart
fun validateName(name: String): String {
    require(name.isNotBlank()) { "Name cannot be blank" }
    return name
}

println(validateName("Adam")) // Adam
// validateName("") //  will fail
// validateName("  \t\n") //  will fail
//sampleEnd
}

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Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.text/is-not-blank.html