a live variable of any type in kotlin which actively listens and propagates change to it

live.kt

package com.dawnimpulse.wallup.utils.reusables

import kotlin.properties.Delegates

class Live<T>(private val value1: T) {
    private lateinit var change: (T) -> Unit

    var value: T by Delegates.observable(value1) { _, _, new ->
        if (::change.isInitialized)
            change(new)
    }

    fun onChange(change: (T) -> Unit) {
        this.change = change
    }
}