[JS IR BE] hashCode, toString, number conversion support

libraries/stdlib/js/irRuntime/compareTo.kt

@@ -0,0 +1,43 @@
+/*
+ * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the license/LICENSE.txt file.
+ */
+
+package kotlin.js
+
+
+// Adopted from misc.js
+
+fun compareTo(a: dynamic, b: dynamic): Int {
+    var typeA = typeOf(a)
+    if (typeA == "number") {
+        if (typeOf(b) == "number") {
+            return doubleCompareTo(a, b)
+        }
+        return primitiveCompareTo(a, b)
+    }
+    if (typeA == "string" || typeA == "boolean") {
+        return primitiveCompareTo(a, b)
+    }
+
+    // TODO: Replace to a.unsafeCast<Comparable<*>>().compareTo(b) when bridge is implemented
+    return js("a.compareTo(b)").unsafeCast<Int>()
+}
+
+fun primitiveCompareTo(a: dynamic, b: dynamic): Int =
+    js("a < b ? -1 : a > b ? 1 : 0").unsafeCast<Int>()
+
+fun doubleCompareTo(a: dynamic, b: dynamic): Int =
+    js("""
+    if (a < b) return -1;
+    if (a > b) return 1;
+
+    if (a === b) {
+        if (a !== 0) return 0;
+
+        var ia = 1 / a;
+        return ia === 1 / b ? 0 : (ia < 0 ? -1 : 1);
+    }
+
+    return a !== a ? (b !== b ? 0 : 1) : -1
+    """).unsafeCast<Int>()