fun isValidKotlinIdentifier()

in smithy-kotlin-codegen/src/main/kotlin/software/amazon/smithy/kotlin/codegen/lang/KotlinTypes.kt [90:99]

• 10 lines of code
• 5 McCabe index (conditional complexity)

fun isValidKotlinIdentifier(s: String): Boolean {
    s.forEachIndexed { idx, chr ->
        val isLetterOrUnderscore = chr.isLetter() || chr == '_'
        when (idx) {
            0 -> if (!isLetterOrUnderscore) return false
            else -> if (!isLetterOrUnderscore && !chr.isDigit()) return false
        }
    }
    return true
}