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Rooted by: Factorial
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  • Description

    Using the reduce methods

     Code 
    fun fact(n: Int): Int {
    return (1..n).reduce { acc, i -> acc * i }
}
    Test Cases 
    // You can test using JUnit or KotlinTest. JUnit is shown below
// TODO: replace this example test with your own, this is just here to demonstrate usage.

// TODO: replace with whatever your package is called


import kotlin.test.assertEquals
import org.junit.Test

class FactTest {
  @Test
  fun testFact() {
    assertEquals(2, fact(2))
    assertEquals(720, fact(6))
    assertEquals(3628800, fact(10))
  }
}
    View Run Output
  • Code
    • fun fact(n: Int): Int {
    • return (1..n).fold(1) { acc, i -> acc * i }
    • return (1..n).reduce { acc, i -> acc * i }
    • }