196日目

日記

一年分の民放見てる

今日書いたコード

fun main() {
    val peopleAges = mutableMapOf<String, Int>(
        "Fred" to 30,
        "Ann" to 23
    )
    peopleAges.put("Barbara", 42)
    peopleAges["Joe"] = 51
    peopleAges["Fred"] = 31
    peopleAges.forEach { print("${it.key} is ${it.value}, ") }
    println()
    println(peopleAges.map { "${it.key} is ${it.value}" }.joinToString(", ") )
    val filteredNames = peopleAges.filter { it.key.length < 4 }
    println(filteredNames)
}

Fred is 31, Ann is 23, Barbara is 42, Joe is 51, 
Fred is 31, Ann is 23, Barbara is 42, Joe is 51
{Ann=23, Joe=51}

感想

filterもある