Rename PlaceValue property 'unit' to 'magnitude'

src/main/kotlin/RomanNumerals.kt

@@ -3,7 +3,7 @@ private val powersOfTen = listOf(1000, 100, 10, 1)
 fun Int.toRoman(): String {
     val placeValues = toDecimalPlaceValues(this)
     return placeValues.map {
-        it.unit.toRomanDigit().repeat(it.multiplier)
+        it.magnitude.toRomanDigit().repeat(it.multiplier)
     }.joinToString(separator = "")
 }
 
@@ -13,11 +13,11 @@ fun toDecimalPlaceValues(number: Int): List<PlaceValue> {
     }
     val largestPowerNeeded = powersOfTen.find { number >= it } ?: 1
     if (largestPowerNeeded == 1) {
-        return listOf(PlaceValue(number, 1))
+        return listOf(PlaceValue(multiplier = number, magnitude = 1))
     } else {
         val multiplier = number / largestPowerNeeded
         val remainder = number % largestPowerNeeded
-        return listOf(PlaceValue(multiplier, largestPowerNeeded)) + toDecimalPlaceValues(remainder)
+        return listOf(PlaceValue(multiplier, magnitude = largestPowerNeeded)) + toDecimalPlaceValues(remainder)
     }
 }
 
@@ -31,6 +31,6 @@ private fun Int.toRomanDigit(): String = when(this) {
 
 internal class RomanNumeralException(message: String) : RuntimeException(message)
 
-data class PlaceValue(val multiplier: Int, val unit: Int) {
-    override fun toString(): String = "$multiplier*$unit"
+data class PlaceValue(val multiplier: Int, val magnitude: Int) {
+    override fun toString(): String = "$multiplier*$magnitude"
 }