W3cubDocs

/Kotlin

sumByDouble

Platform and version requirements: JVM (1.0), JS (1.0), Native (1.0)
inline fun CharSequence.sumByDouble(
    selector: (Char) -> Double
): Double

Returns the sum of all values produced by selector function applied to each character in the char sequence.

© 2010–2020 JetBrains s.r.o. and Kotlin Programming Language contributors
Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.text/sum-by-double.html