ch8n

/**
 * This method converts dp unit to equivalent pixels, depending on device density. 
 * 
 * @param dp A value in dp (density independent pixels) unit. Which we need to convert into pixels
 * @param context Context to get resources and device specific display metrics
 * @return A float value to represent px equivalent to dp depending on device density
 */

inline fun Context.dpToPixel(dp:Float) : Float {
  return dp * (resource.displayMertics.densityDpi / DisplayMetrics.DENSITY_DEFAULT).toFloat();

ch8n

override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
        val bottomSheet: BottomSheetDialog = super.onCreateDialog(savedInstanceState) as BottomSheetDialog
        bottomSheet.setOnShowListener { dialog ->
            val bottomSheetDialog: BottomSheetDialog? = dialog as? BottomSheetDialog
            val bottomSheetBehaviour = bottomSheetDialog?.findViewById(com.google.android.material.R.id.design_bottom_sheet) as? FrameLayout
            BottomSheetBehavior.from(bottomSheetBehaviour).setState(BottomSheetBehavior.STATE_EXPANDED)
        }
        return bottomSheet
    }

ch8n

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ch8n

// View Visisibility toggle
fun View.setVisibility(isVisibe: Boolean) = if (isVisibe) {
    this.setVisibility(View.VISIBLE)
} else {
    this.setVisibility(View.GONE)
}

//concise start activity 
inline fun <reified T : AppCompatActivity> AppCompatActivity.launchActivity(bundle: Bundle = android.os.Bundle()) {

ch8n

//using person data class

var map: HashMap<Int, Person> = HashMap()

map.put(1, person)
 
for((key, value) in map){
    println("Key: $key, Value: $value")
}

ch8n

// Destructuring declarations can also be used when working with return values:
fun getPerson() = Person("ch8n", 25)
val(name, age) = getPerson()

//Or let’s say we need to return two values from a function:

fun getInfo(): Pair<Int, String> = Pair("ch8n", 25)
val (name, age) = twoValuesReturn()

ch8n

data class Contact(val email,val twitter)
data class Person(val contactInfo:Contact,name:String,Phone:Long)

val contact = Contact("[email protected]","twitter@Ch8n2")
val dev = Person(contact,"ch8n",99999999) 

# unwrapping level one params
with(contact){
  //do anything with email and twitter 
  ...

ch8n

//initally
data class Items(val one: Int, val two: Int, val three: Int)

val item = Items(1,2,3)

// destructing
val (one, two) = item.run { arrayOf(one, two) } // Enforcing position destructing 
println("$one $two")

//after refactor

ch8n

//Gotcha #5 refactoring issue/ no compileTimeCheck
data class ContactMe(val email: String, val phone: String, val twitter: String)

val contact = ContactMe("[email protected]","999999999","ch8n2@twitter")
//destructing
val (email,phone,twitter) = contact

data class ContactMe(val email: String, val phone: String, val medium:String,val twitter: String)

val contact = ContactMe("[email protected]","999999999","ch8n@medium","ch8n2@twitter")

ch8n

//Gotcha #3 
data class Items(val one:Int,val two:Int,val three:Int)

val items = Items(1,2,3)

val (one, requiredOnlyThis ,three)= items // even if we require "requiredOnlyThis" paramter we still need to destructure all
println(requiredOnlyThis) 

//best practice for destructure of unused variables
val (_,requiredOnlyThis,_)= items