From a6c01f82b255e11d047ac71517257a761dba8cd6 Mon Sep 17 00:00:00 2001
From: Ilya Ryzhenkov <orangy@jetbrains.com>
Date: Fri, 18 Apr 2014 19:20:33 +0400
Subject: [PATCH] Make isNaN check language independent, working in JVM & JS

---
 libraries/stdlib/src/kotlin/Numbers.kt | 13 +++++++++++++
 libraries/stdlib/src/kotlin/Ranges.kt  |  4 ++--
 2 files changed, 15 insertions(+), 2 deletions(-)
 create mode 100644 libraries/stdlib/src/kotlin/Numbers.kt

diff --git a/libraries/stdlib/src/kotlin/Numbers.kt b/libraries/stdlib/src/kotlin/Numbers.kt
new file mode 100644
index 00000000000..baf74f35640
--- /dev/null
+++ b/libraries/stdlib/src/kotlin/Numbers.kt
@@ -0,0 +1,13 @@
+package kotlin
+
+/**
+ * Returns {@code true} if the specified number is a
+ * Not-a-Number (NaN) value, {@code false} otherwise.
+ */
+fun Double.isNaN() = this != this
+
+/**
+ * Returns {@code true} if the specified number is a
+ * Not-a-Number (NaN) value, {@code false} otherwise.
+ */
+fun Float.isNaN() = this != this
\ No newline at end of file
diff --git a/libraries/stdlib/src/kotlin/Ranges.kt b/libraries/stdlib/src/kotlin/Ranges.kt
index 6ee4e41b93b..16cee9b9884 100644
--- a/libraries/stdlib/src/kotlin/Ranges.kt
+++ b/libraries/stdlib/src/kotlin/Ranges.kt
@@ -135,13 +135,13 @@ public fun LongRange.step(step: Long): LongProgression {
 }
 
 public fun FloatRange.step(step: Float): FloatProgression {
-    if (java.lang.Float.isNaN(step)) throw IllegalArgumentException("Step must not be NaN")
+    if (step.isNaN()) throw IllegalArgumentException("Step must not be NaN")
     checkStepIsPositive(step > 0, step)
     return FloatProgression(start, end, step)
 }
 
 public fun DoubleRange.step(step: Double): DoubleProgression {
-    if (java.lang.Double.isNaN(step)) throw IllegalArgumentException("Step must not be NaN")
+    if (step.isNaN()) throw IllegalArgumentException("Step must not be NaN")
     checkStepIsPositive(step > 0, step)
     return DoubleProgression(start, end, step)
 }