Kotlin メモ : count

https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.text/count.html


大文字数を数えるダメな例

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1. val String.upperCaseCount: Int  
2.     get() = filter { it.isUpperCase() }.length  

val String.upperCaseCount: Int get() = filter { it.isUpperCase() }.length

大文字数を数える良い例

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1. val String.upperCaseCount: Int  
2.     get() = count { it.isUpperCase() }  

val String.upperCaseCount: Int get() = count { it.isUpperCase() }