vamsitallapudi

//Lambda Expression
val areaOfRectangle = { length: Int, breadth: Int -> (length * breadth) }

vamsitallapudi

fun main() {
    areaOfRectangle(10,20)
}

vamsitallapudi

//simplified version
val areaOfRectangleSimplified: (Int, Int) -> Int = { length, breadth -> length * breadth }

vamsitallapudi

fun main() {
    areaOfRectangleSimplified(30,40)
}

vamsitallapudi

val list = listOf(1, 3, 5, 7, 9)
//    fold function is taking a parameter and a lambda expression
println(list.fold(1, { a, b -> a * b }))

vamsitallapudi

val list = listOf(1, 3, 5, 7, 9)
//    if the lambda expression is the last parameter, we can move the parameter out
println(list.fold(1) { a, b -> a * b })

vamsitallapudi

val list = listOf(1, 3, 5, 7, 9)
//    a function taking a single function as a parameter
list.forEach({ println(it) }) //it -> iterator which iterates and gives each value of list

vamsitallapudi

//    if parameter is a single lambda expression, we can omit the paranthesis
    list.forEach { println() }

vamsitallapudi

<uses-permission android:name="android.permission.INTERNET"/> 
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/> 
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

vamsitallapudi

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
                xmlns:tools="http://schemas.android.com/tools"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:background="@color/colorAccent"
                android:paddingTop="@dimen/activity_vertical_margin"
                tools:context="com.coderefer.uploadfiletoserver.MainActivity">

    <TextView