Example of using Kotlin extension functions to reduce boilerplate when dealing with Android Intents.

IntentExtensions.kt

package com.carte_app.carte.util

import android.content.Intent

fun Intent.addLocation(location: Location): Intent {
    putExtra(IntentExtensions.INTENT_PARAM_LOCATION_LAT, location.lat)
    putExtra(IntentExtensions.INTENT_PARAM_LOCATION_LNG, location.lng)
    return this
}

fun Intent.location(): Location {
    val lat = getDoubleExtra(IntentExtensions.INTENT_PARAM_LOCATION_LAT, Location.EMPTY_VALUE)
    val lng = getDoubleExtra(IntentExtensions.INTENT_PARAM_LOCATION_LNG, Location.EMPTY_VALUE)

    return Location(lat, lng)
}

class IntentExtensions {
    companion object {
        val INTENT_PARAM_LOCATION_LAT = "t3ikl3n"
        val INTENT_PARAM_LOCATION_LNG = "tygvwewdf"
    }
}

data class Location(val lat: Double, val lng: Double) {
    companion object {
        val EMPTY_VALUE = Double.MAX_VALUE
        fun emptyLocation() = Location(EMPTY_VALUE, EMPTY_VALUE)
    }
}

To add a location to an Intent:

intent.addLocation(Location(lat, lng))

To get a location from an Intent:

val location = intent.location()

location will equal emptyLocation() if there is no location in the Intent