Collection Helpers

Use collection helpers to transform and summarize a short list.

CollectionHelpers.kt

fun main() {
    val bonus = 
    val scores = listOf(1, 3, 5)
    val adjusted = scores.map { score ->
        score + bonus
    }
    val high = adjusted.filter { score ->
        score >= 5
    }
    val summary = high.joinToString("-")

    println("bonus=$bonus")
    println("count=${high.size}")
    println("summary=$summary")
}

fun main() {
    val bonus = 
    val scores = listOf(1, 3, 5)
    val adjusted = scores.map { score ->
        score + bonus
    }
    val high = adjusted.filter { score ->
        score >= 5
    }
    val summary = high.joinToString("-")

    println("bonus=$bonus")
    println("count=${high.size}")
    println("summary=$summary")
}

fun main() {
    val bonus = 
    val scores = listOf(1, 3, 5)
    val adjusted = scores.map { score ->
        score + bonus
    }
    val high = adjusted.filter { score ->
        score >= 5
    }
    val summary = high.joinToString("-")

    println("bonus=$bonus")
    println("count=${high.size}")
    println("summary=$summary")
}

collection-helpers Small helpers such as `map`, `filter`, and `joinToString` make collection steps readable.