CODEWITHSUNDEEP
kotlin
FredSuvn
FredSuvn

Reputation: 2087

How to call buildin extension function in same-name extension function in kotlin?

kotlin has two buildin extension functions in kotlin.text:

public actual inline fun String.toBoolean()
public actual inline fun String?.toBoolean()

Now I want to add toBoolean for Any?:

fun Any?.toBoolean(): Boolean {
    return when(this){
        null -> false
        is Boolean -> this
        is Boolean? -> this

        // Here toBoolean() is this function itself, not kotlin.text.String.toBoolean
        else -> toString().toBoolean()
    }
}

in else -> toString().toBoolean(), the toBoolean() function is not same-name extension function in kotlin.text, see the comment.

I tried to import kotlin.text.toBoolean or kotlin.text.String.toBoolean, but didn't work.

Upvotes: 0

Views: 196

Answers (1)

Tenfour04
Tenfour04

Reputation: 93609

You can import the function you want to call using a different name like this:

import kotlin.text.toBoolean as stringToBoolean

fun Any?.toBoolean(): Boolean {
    return when(this){
        null -> false
        is Boolean -> this
        is Boolean? -> this
        else -> toString().stringToBoolean()
    }
}

By the way, is Boolean? -> this is a redundant check.

Upvotes: 4

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