Kotlin - Strings

indexOf and substring

• indexOf
• substring
• split

package examples

fun main() {

    println("abc".indexOf('c'))     // 2

    println("abc".substring(1))  // bc

    println("abcdefg".substring(1 until 5)) // bcde

    println("abcdefg".substring(1 .. 5)) // bcdef

    println("a,b,c,d,e".split(",")) // [a, b, c, d, e]

    val (v1,v2,v3) = "a,b,c,d,e".split(",")

    println("$v1, $v2, $v3") // a, b, c

}

Replace with regular expression

package examples

fun main() {

    val replaceResult = "abc".replace(Regex("b"), transform = {

        when(it.value) {

            "b" -> "B"

            else -> it.value

        }

    })

    println(replaceResult) // aBc

}

Compare String

package examples

fun main() {

    val s1 = "" + "a"

    val s2 = "a"

    println(s1 == s2) // true

    println(s1 === s2) // true

}

Unicode and forEach

package examples

fun main() {

    println("\u0045") // E

    "abc".forEach { println(it) } // print a b c in separated lines

}