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add method to get vertices sorted by their degree #68

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add method to get vertices sorted by their degree #68

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fcfbca5
add method to get vertices sorted by their degree
Morinator Mar 17, 2023
0820027
formatting with ktlint
Morinator Mar 19, 2023
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4 changes: 4 additions & 0 deletions src/main/kotlin/sipura/alg/Traversal.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -127,4 +127,8 @@ object Traversal {
}
}
}

fun <V> degreeSort(g: SimpleGraph<V>, ascending: Boolean = true): List<V> {
return if (ascending) g.V.sortedBy { g.degreeOf(it) } else g.V.sortedByDescending { g.degreeOf(it) }
}
}
18 changes: 18 additions & 0 deletions src/test/kotlin/sipura/alg/TraversalTest.kt
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Expand Up @@ -4,6 +4,7 @@ import org.junit.jupiter.api.Nested
import org.junit.jupiter.api.Test
import org.junit.jupiter.api.assertThrows
import sipura.Samples
import sipura.alg.Traversal.degreeSort
import sipura.generate.Factory
import kotlin.test.assertContains
import kotlin.test.assertEquals
Expand Down Expand Up @@ -144,4 +145,21 @@ internal class TraversalTest {
assertFalse { iter.hasNext() }
}
}

@Nested
internal inner class VerticesOrderedByDegree {

@Test
fun `vertices sorted by degree`() {
assertEquals(degreeSort(Samples.star4Plus1IsolatedVertex()).last(), 1)
assertEquals(degreeSort(Samples.star4Plus1IsolatedVertex(), ascending = false).first(), 1)
}

@Test
fun `path of length 3`() {
val path3 = Factory.createPathGraph(3)
assertEquals(degreeSort(path3).last(), 2)
assertEquals(degreeSort(path3, ascending = false).first(), 2)
}
}
}