Print an array in Kotlin

How to print an array in Kotlin?

var arr = arrayOf(1, '2', "three")

// method 1
for(elem in arr){
    println("$elem")
}

// method 2
println("arr = ${arr.contentToString()}")

// method 3
println("arr = ${arr.joinToString(", ")}")

// method 4
println("arr = ${arr.contentDeepToString()}")