sajjadyousefnia

public inline fun <T, R> with(receiver: T, block: T.() -> R): R {
    contract {
        callsInPlace(block, InvocationKind.EXACTLY_ONCE)
    }
    return receiver.block()
}

sajjadyousefnia

public inline fun <T, R> T.run(block: T.() -> R): R {
    contract {
        callsInPlace(block, InvocationKind.EXACTLY_ONCE)
    }
    return block()
}

sajjadyousefnia

public inline fun <R> run(block: () -> R): R {
    contract {
        callsInPlace(block, InvocationKind.EXACTLY_ONCE)
    }
    return block()
}

sajjadyousefnia

// Yack!
with(webview.settings) {
      this?.javaScriptEnabled = true
      this?.databaseEnabled = true
   }
}

// Nice.
webview.settings?.run {
    javaScriptEnabled = true

sajjadyousefnia

with(webview.settings) {
    javaScriptEnabled = true
    databaseEnabled = true
}

// similarly

webview.settings.run {
    javaScriptEnabled = true
    databaseEnabled = true

sajjadyousefnia

"Hello, World" matches "^Hello".toRegex()

sajjadyousefnia

if ((targetUser.isEnabled and !targetUser.isBlocked) or currentUser.admin) {
    // Do something if the current user is an Admin, or the target user is active
}

sajjadyousefnia

val color = 0x123456
val red = (color and 0xff0000) shr 16
val green = (color and 0x00ff00) shr 8
val blue = (color and 0x0000ff) shr 0

sajjadyousefnia

map(
  1 to "one",
  2 to "two",
  3 to "three"
)

sajjadyousefnia

val callingCodesPairMap: Map<Int, String> = mapOf(Pair(234, "Nigeria"), Pair(1, "USA"), Pair(233, "Ghana"))