What name should I use instead of `toNumber()` for...

# codereview

[alex cole]

What name should I use instead of toNumber() for the following code to follow the kotlin style guide.

class ArrayND {
    var data: ArrayList<Double> = {...}
    var shape: Array<Int> = {...}

    operator fun get(vararg indicies: Int): ArrayND {...}

    fun toNumber(): Double {
        if (data.size == 1) {
            return data[0]
        } else {
            Throw Error
        }
    }
}

[ephemient]

fun single() = data.single()

[alex cole]

Thank you.