[Wasm] Implement platform random in stdlib

2021-11-11 19:05:53 +03:00
parent 1bdc9edb20
commit 9e00a2c5b4
1 changed files with 8 additions and 2 deletions
@@ -5,5 +5,11 @@

 package kotlin.random

-internal actual fun defaultPlatformRandom(): Random = TODO("Wasm stdlib: Random")
-internal actual fun doubleFromParts(hi26: Int, low27: Int): Double = TODO("Wasm stdlib: Random")
+@JsFun("() => ((Math.random() * Math.pow(2, 32)) | 0)")
+private external fun initialSeed(): Int
+
+internal actual fun defaultPlatformRandom(): Random =
+    Random(initialSeed())
+
+internal actual fun doubleFromParts(hi26: Int, low27: Int): Double =
+    (hi26.toLong().shl(27) + low27) / (1L shl 53).toDouble()