Kotlin Ternary Operator implementations

Things.kt

package ds.features.kotlin


fun ternaryTest() {

    val rand = Math.random()

    // ternary
    val a = (rand > 0.5)(1, 0)
    val b = isLoggedIn()["logged", "screwed"]
    val c = isLoggedIn() then "logged" ?: "screwed"
    val d = isLoggedIn() { "logged" to "screwed" }
}


// ternary A
inline fun Boolean.invoke<T>(yes: T, no: T): T = if (this) yes else no

// ternary B
inline fun Boolean.get<T>(yes: T, no: T): T = if (this) yes else no

// ternary C
inline fun Boolean.then<T>(param1: T): T? = if (this) param1 else null

// ternary D
inline fun Boolean.invoke<T>(f: () -> Pair<T, T>): T {
    val (yes, no) = f()
    if (this) return yes else return no
}

fun isLoggedIn() = true