How to convert String to Long in Kotlin?

Question

So, due to lack of methods like Long.valueOf(String s) I am stuck.

How to convert String to Long in Kotlin?

Answer 1

To convert a String to Long (that represents a 64-bit signed integer) in Kotlin 1.3 is quite simple.

You can use any of the following three methods:

val number1: Long = "789".toLong()
println(number1)                                   // 789

val number2: Long? = "404".toLongOrNull()
println("number = $number2")                       // number = 404

val number3: Long? = "Error404".toLongOrNull()    
println("number = $number3")                       // number = null

val number4: Long? = "111".toLongOrNull(2)
println("numberWithRadix(2) = $number4")           // numberWithRadix(2) = 7