How to Implement the Builder Pattern in Kotlin

The builder design pattern helps overcome many object creation problems, especially requiring multiple parameters.

Using the builder pattern will enable the creation of an immutable object with multiple parameters. This article discusses how to implement the builder pattern in Kotlin.

Implement Kotlin Builder Pattern

While the builder pattern can have several benefits, it is advised not to use it in Kotlin. The reason is that the Kotlin builder pattern has no effective use in this programming language.

Kotlin has default and named arguments that can function similarly to the builder pattern. However, if you want to create a Kotlin builder pattern, use the following code snippet.

Code:

class builderExample{
    private var Str:String? = null

    fun setStr(Str:String){
        this.Str = Str
    }
    fun getStr():String?{
        return this.Str
    }
}

class classExm{
    var m:builderExample
    constructor(builderExample:builderExample) {
        this.m = builderExample
    }
    fun build():String{
        return ("Example of how to implement Kotlin builder pattern")
    }
}

fun main(args: Array<String>) {
    var builderExample = builderExample()
    builderExample.setStr("KotlinProgramming")

    var mainObj = classExm(builderExample)
    println(mainObj.build())
}

Output: