Moved *Range.step() functions to stdlib.

libraries/stdlib/src/kotlin/Ranges.kt

@@ -23,7 +23,7 @@ public fun FloatSequence.reversed(): FloatSequence {
 public fun LongSequence.reversed(): LongSequence {
     return LongSequence(end, start, -increment)
 }
-    
+
 public fun DoubleSequence.reversed(): DoubleSequence {
     return DoubleSequence(end, start, -increment)
 }
@@ -57,3 +57,79 @@ public fun DoubleRange.reversed(): DoubleSequence {
     return DoubleSequence(end, start, -1.0)
 }
 
+
+public fun IntSequence.step(step: Int): IntSequence {
+    checkStepIsPositive(step > 0, step)
+    return IntSequence(start, end, if (increment > 0) step else -step)
+}
+
+public fun CharacterSequence.step(step: Int): CharacterSequence {
+    checkStepIsPositive(step > 0, step)
+    return CharacterSequence(start, end, if (increment > 0) step else -step)
+}
+
+public fun ByteSequence.step(step: Int): ByteSequence {
+    checkStepIsPositive(step > 0, step)
+    return ByteSequence(start, end, if (increment > 0) step else -step)
+}
+
+public fun ShortSequence.step(step: Int): ShortSequence {
+    checkStepIsPositive(step > 0, step)
+    return ShortSequence(start, end, if (increment > 0) step else -step)
+}
+
+public fun LongSequence.step(step: Long): LongSequence {
+    checkStepIsPositive(step > 0, step)
+    return LongSequence(start, end, if (increment > 0) step else -step)
+}
+
+public fun FloatSequence.step(step: Float): FloatSequence {
+    checkStepIsPositive(step > 0, step)
+    return FloatSequence(start, end, if (increment > 0) step else -step)
+}
+
+public fun DoubleSequence.step(step: Double): DoubleSequence {
+    checkStepIsPositive(step > 0, step)
+    return DoubleSequence(start, end, if (increment > 0) step else -step)
+}
+
+
+public fun IntRange.step(step: Int): IntSequence {
+    checkStepIsPositive(step > 0, step)
+    return IntSequence(start, end, step)
+}
+
+public fun CharRange.step(step: Int): CharacterSequence {
+    checkStepIsPositive(step > 0, step)
+    return CharacterSequence(start, end, step)
+}
+
+public fun ByteRange.step(step: Int): ByteSequence {
+    checkStepIsPositive(step > 0, step)
+    return ByteSequence(start, end, step)
+}
+
+public fun ShortRange.step(step: Int): ShortSequence {
+    checkStepIsPositive(step > 0, step)
+    return ShortSequence(start, end, step)
+}
+
+public fun LongRange.step(step: Long): LongSequence {
+    checkStepIsPositive(step > 0, step)
+    return LongSequence(start, end, step)
+}
+
+public fun FloatRange.step(step: Float): FloatSequence {
+    checkStepIsPositive(step > 0, step)
+    return FloatSequence(start, end, step)
+}
+
+public fun DoubleRange.step(step: Double): DoubleSequence {
+    checkStepIsPositive(step > 0, step)
+    return DoubleSequence(start, end, step)
+}
+
+
+private fun checkStepIsPositive(isPositive: Boolean, step: Number) {
+    if (!isPositive) throw IllegalArgumentException("Step must be positive, was: $step")
+}