Kotlin infix

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Example

Add new add operation keyword

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infix fun Int.add(x: Int): Int {
    return this + x
}

fun main() {
    val result = 100 add 200
    println(result)
}

Add add operation to Class

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class Account(
        private var balance: Double = 0.0
) {
    infix fun add(amount: Double): Double {
        return this.balance.plus(amount)
    }
}

fun main() {
    val account = Account(10.0)
    
    val result = account add 1.0
    println(result)
}
//  result is 11.0