Use standard random API (#1988)

* Use standard random API
* Inline 'random' method

Author: turansky

js/example-frontend-js/src/ExampleMain.kt

@@ -11,6 +11,7 @@ import org.w3c.dom.*
 import kotlin.browser.*
 import kotlin.coroutines.*
 import kotlin.math.*
+import kotlin.random.Random
 
 fun main() {
     println("Starting example application...")
@@ -35,9 +36,6 @@ private fun HTMLElement.setPosition(x: Double, y: Double) {
     }
 }
 
-@Suppress("DEPRECATION")
-private fun random() = kotlin.js.Math.random()
-
 class Application : CoroutineScope {
     private val body get() = document.body!!
     private val scene get() = document.getElementById("scene") as HTMLElement
@@ -125,7 +123,7 @@ class Application : CoroutineScope {
                     timer.delay(1000) // pause a bit
                     // flip direction
                     val t = vx
-                    if (random() > 0.5) {
+                    if (Random.nextDouble() > 0.5) {
                         vx = vy
                         vy = -t
                     } else {
@@ -150,11 +148,11 @@ class Application : CoroutineScope {
         animation("circle", radius) { circle ->
             println("Started new 'circle' coroutine #$index")
             val timer = AnimationTimer()
-            val initialAngle = random() * 2 * PI
+            val initialAngle = Random.nextDouble() * 2 * PI
             var vx = sin(initialAngle) * initialSpeed
             var vy = cos(initialAngle) * initialSpeed
-            var x = (random() * initialRange + (1 - initialRange) / 2) * sw
-            var y = (random() * initialRange + (1 - initialRange) / 2) * sh
+            var x = (Random.nextDouble() * initialRange + (1 - initialRange) / 2) * sw
+            var y = (Random.nextDouble() * initialRange + (1 - initialRange) / 2) * sh
             while (true) {
                 val dt = timer.await()
                 val dx = sw / 2 - x