Kotlin 1.5 new warnings - the rest (#5151)

core/src/com/unciv/logic/HexMath.kt

@@ -208,7 +208,7 @@ object HexMath {
             val top = height / 2 -  (x + y) / 2
             // kotlin's Int division rounds in different directions depending on sign! Thus 1 extra `-1`
             val bottom = (x + y - 1) / 2 + (height - 1) / 2
-            return min(min(left, right), min(top, bottom))
+            return minOf(left, right, top, bottom)
         } else {
             val radius = mapParameters.mapSize.radius
             if (mapParameters.worldWrap) {

core/src/com/unciv/logic/battle/BattleDamage.kt

@@ -170,7 +170,7 @@ object BattleDamage {
         } else if (attacker is CityCombatant) {
             if (attacker.city.getCenterTile().militaryUnit != null) {
                 val garrisonBonus = attacker.city.getMatchingUniques("+[]% attacking strength for cities with garrisoned units")
-                    .sumBy { it.params[0].toInt() }
+                    .sumOf { it.params[0].toInt() }
                 if (garrisonBonus != 0)
                     modifiers["Garrisoned unit"] = garrisonBonus
             }

core/src/com/unciv/logic/battle/CityCombatant.kt

@@ -57,7 +57,7 @@ class CityCombatant(val city: CityInfo) : ICombatant {
         if (cityTile.militaryUnit != null)
             strength += cityTile.militaryUnit!!.baseUnit().strength * (cityTile.militaryUnit!!.health / 100f) * 0.2f
 
-        var buildingsStrength = city.cityConstructions.getBuiltBuildings().sumBy { it.cityStrength }.toFloat()
+        var buildingsStrength = city.cityConstructions.getBuiltBuildings().sumOf { it.cityStrength }.toFloat()
         if (getCivInfo().hasUnique("Defensive buildings in all cities are 25% more effective"))
             buildingsStrength *= 1.25f
         strength += buildingsStrength

core/src/com/unciv/logic/city/CityInfo.kt

@@ -3,7 +3,6 @@ package com.unciv.logic.city
 import com.badlogic.gdx.math.Vector2
 import com.unciv.logic.battle.CityCombatant
 import com.unciv.logic.civilization.CivilizationInfo
-import com.unciv.logic.civilization.GreatPersonManager
 import com.unciv.logic.civilization.ReligionState
 import com.unciv.logic.civilization.diplomacy.DiplomacyFlags
 import com.unciv.logic.map.RoadStatus
@@ -15,10 +14,7 @@ import com.unciv.models.ruleset.tile.ResourceSupplyList
 import com.unciv.models.ruleset.tile.ResourceType
 import com.unciv.models.ruleset.unit.BaseUnit
 import com.unciv.models.stats.Stat
-import com.unciv.models.translations.equalsPlaceholderText
-import com.unciv.models.translations.getPlaceholderParameters
 import java.util.*
-import kotlin.collections.ArrayList
 import kotlin.collections.HashMap
 import kotlin.collections.HashSet
 import kotlin.math.ceil
@@ -27,6 +23,7 @@ import kotlin.math.pow
 import kotlin.math.roundToInt
 
 class CityInfo {
+    @Suppress("JoinDeclarationAndAssignment")
     @Transient
     lateinit var civInfo: CivilizationInfo
 
@@ -87,7 +84,7 @@ class CityInfo {
         this.civInfo = civInfo
         foundingCiv = civInfo.civName
         turnAcquired = civInfo.gameInfo.turns
-        this.location = cityLocation
+        location = cityLocation
         setTransients()
 
         setNewCityName(civInfo)
@@ -250,8 +247,7 @@ class CityInfo {
             .filter { it.uniques.contains("Indicates the capital city") }
 
         val civSpecificBuilding = indicatorBuildings.firstOrNull { it.uniqueTo == civInfo.civName }
-        if (civSpecificBuilding != null) return civSpecificBuilding.name
+        return civSpecificBuilding?.name ?: indicatorBuildings.first().name
-        else return indicatorBuildings.first().name
     }
 
     fun isConnectedToCapital(connectionTypePredicate: (Set<String>) -> Boolean = { true }): Boolean {
@@ -382,7 +378,7 @@ class CityInfo {
             buildingsCounter.add(building.greatPersonPoints)
         sourceToGPP["Buildings"] = buildingsCounter
 
-        for ((source, gppCounter) in sourceToGPP) {
+        for ((_, gppCounter) in sourceToGPP) {
             for (unique in civInfo.getMatchingUniques("[] is earned []% faster")) {
                 val unitName = unique.params[0]
                 if (!gppCounter.containsKey(unitName)) continue
@@ -437,7 +433,7 @@ class CityInfo {
     }
 
     internal fun getMaxHealth() =
-        200 + cityConstructions.getBuiltBuildings().sumBy { it.cityHealth }
+        200 + cityConstructions.getBuiltBuildings().sumOf { it.cityHealth }
 
     override fun toString() = name // for debug
     //endregion
@@ -498,7 +494,7 @@ class CityInfo {
         if (isBeingRazed) {
             val removedPopulation =
                 1 + civInfo.getMatchingUniques("Cities are razed [] times as fast")
-                    .sumBy { it.params[0].toInt() - 1 }
+                    .sumOf { it.params[0].toInt() - 1 }
             population.addPopulation(-1 * removedPopulation)
             if (population.population <= 0) {
                 civInfo.addNotification(

core/src/com/unciv/logic/city/CityInfoConquestFunctions.kt

@@ -80,7 +80,7 @@ class CityInfoConquestFunctions(val city: CityInfo){
     /** This happens when we either puppet OR annex, basically whenever we conquer a city and don't liberate it */
     fun puppetCity(conqueringCiv: CivilizationInfo) {
         // Gain gold for plundering city
-        val goldPlundered = getGoldForCapturingCity(conqueringCiv)
+        val goldPlundered = getGoldForCapturingCity(conqueringCiv)  // todo: use this val
         city.apply {
 
             val oldCiv = civInfo
@@ -111,7 +111,7 @@ class CityInfoConquestFunctions(val city: CityInfo){
     private fun diplomaticRepercussionsForConqueringCity(oldCiv: CivilizationInfo, conqueringCiv: CivilizationInfo) {
         val currentPopulation = city.population.population
         val percentageOfCivPopulationInThatCity = currentPopulation * 100f /
-                oldCiv.cities.sumBy { it.population.population }
+                oldCiv.cities.sumOf { it.population.population }
         val aggroGenerated = 10f + percentageOfCivPopulationInThatCity.roundToInt()
 
         // How can you conquer a city but not know the civ you conquered it from?!
@@ -169,7 +169,7 @@ class CityInfoConquestFunctions(val city: CityInfo){
     private fun diplomaticRepercussionsForLiberatingCity(conqueringCiv: CivilizationInfo, conqueredCiv: CivilizationInfo) {
         val foundingCiv = conqueredCiv.gameInfo.civilizations.first { it.civName == city.foundingCiv }
         val percentageOfCivPopulationInThatCity = city.population.population *
-                100f / (foundingCiv.cities.sumBy { it.population.population } + city.population.population)
+                100f / (foundingCiv.cities.sumOf { it.population.population } + city.population.population)
         val respectForLiberatingOurCity = 10f + percentageOfCivPopulationInThatCity.roundToInt()
 
         // In order to get "plus points" in Diplomacy, you have to establish diplomatic relations if you haven't yet
@@ -190,10 +190,10 @@ class CityInfoConquestFunctions(val city: CityInfo){
             }
         }
 
-        val otherCivsRespecForLiberating = (respectForLiberatingOurCity / 10).roundToInt().toFloat()
+        val otherCivsRespectForLiberating = (respectForLiberatingOurCity / 10).roundToInt().toFloat()
         for (thirdPartyCiv in conqueringCiv.getKnownCivs().filter { it.isMajorCiv() && it != conqueredCiv }) {
             thirdPartyCiv.getDiplomacyManager(conqueringCiv)
-                    .addModifier(DiplomaticModifiers.LiberatedCity, otherCivsRespecForLiberating) // Cool, keep at at! =D
+                    .addModifier(DiplomaticModifiers.LiberatedCity, otherCivsRespectForLiberating) // Cool, keep at at! =D
         }
     }
 
@@ -252,5 +252,4 @@ class CityInfoConquestFunctions(val city: CityInfo){
         }
     }
 
-
 }

core/src/com/unciv/logic/city/CityStats.kt

@@ -520,7 +520,7 @@ class CityStats(val cityInfo: CityInfo) {
 
         // AFTER we've gotten all the gold stats figured out, only THEN do we plonk that gold into Science
         if (cityInfo.getRuleset().modOptions.uniques.contains(ModOptionsConstants.convertGoldToScience)) {
-            val amountConverted = (newFinalStatList.values.sumByDouble { it.gold.toDouble() }
+            val amountConverted = (newFinalStatList.values.sumOf { it.gold.toDouble() }
                     * cityInfo.civInfo.tech.goldPercentConvertedToScience).toInt().toFloat()
             if (amountConverted > 0) // Don't want you converting negative gold to negative science yaknow
                 newFinalStatList["Gold -> Science"] = Stats(science = amountConverted, gold = -amountConverted)

core/src/com/unciv/logic/civilization/CityStateFunctions.kt

@@ -10,7 +10,6 @@ import com.unciv.models.stats.Stat
 import com.unciv.models.translations.getPlaceholderParameters
 import com.unciv.models.translations.getPlaceholderText
 import com.unciv.ui.victoryscreen.RankingType
-import java.util.*
 import kotlin.collections.HashMap
 import kotlin.collections.LinkedHashMap
 import kotlin.math.max
@@ -281,12 +280,12 @@ class CityStateFunctions(val civInfo: CivilizationInfo) {
         val bullyRange = max(5, civInfo.gameInfo.tileMap.tileMatrix.size / 10)   // Longer range for larger maps
         val inRangeTiles = civInfo.getCapital().getCenterTile().getTilesInDistanceRange(1..bullyRange)
         val forceNearCity = inRangeTiles
-            .sumBy { if (it.militaryUnit?.civInfo == demandingCiv)
+            .sumOf { if (it.militaryUnit?.civInfo == demandingCiv)
                     it.militaryUnit!!.getForceEvaluation()
                 else 0
             }
         val csForce = civInfo.getCapital().getForceEvaluation() + inRangeTiles
-            .sumBy { if (it.militaryUnit?.civInfo == civInfo)
+            .sumOf { if (it.militaryUnit?.civInfo == civInfo)
                     it.militaryUnit!!.getForceEvaluation()
                 else 0
             }
@@ -337,9 +336,9 @@ class CityStateFunctions(val civInfo: CivilizationInfo) {
         if (!civInfo.isCityState()) throw Exception("You can only demand workers from City-States!")
 
         val buildableWorkerLikeUnits = civInfo.gameInfo.ruleSet.units.filter {
-            it.value.uniqueObjects.any { it.placeholderText == Constants.canBuildImprovements }
+            it.value.uniqueObjects.any { unique -> unique.placeholderText == Constants.canBuildImprovements }
-                    && it.value.isBuildable(civInfo)
                     && it.value.isCivilian()
+                    && it.value.isBuildable(civInfo)
         }
         if (buildableWorkerLikeUnits.isEmpty()) return  // Bad luck?
         demandingCiv.placeUnitNearTile(civInfo.getCapital().location, buildableWorkerLikeUnits.keys.random())
@@ -356,7 +355,7 @@ class CityStateFunctions(val civInfo: CivilizationInfo) {
         val allyBonuses = eraInfo.allyBonus[civInfo.cityStateType.name]
         if (allyBonuses != null) {
             // Defined city states in json
-            val bonuses = allyBonuses + eraInfo!!.friendBonus[civInfo.cityStateType.name]!!
+            val bonuses = allyBonuses + eraInfo.friendBonus[civInfo.cityStateType.name]!!
             for (bonus in bonuses) {
                 if (statType == Stat.Happiness && bonus.getPlaceholderText() == "Provides [] Happiness")
                     return true

core/src/com/unciv/logic/civilization/CivInfoStats.kt

@@ -74,7 +74,7 @@ class CivInfoStats(val civInfo: CivilizationInfo) {
         for (city in civInfo.cities) {
             for (tile in city.getTiles()) {
                 if (tile.isCityCenter()) continue
-                if (tile.roadStatus == RoadStatus.None) continue // Cheap checks before pricy checks
+                if (tile.roadStatus == RoadStatus.None) continue // Cheap checks before pricey checks
                 if (ignoredTileTypes.any { tile.matchesFilter(it, civInfo) }) continue
 
                 transportationUpkeep += tile.roadStatus.upkeep
@@ -193,7 +193,7 @@ class CivInfoStats(val civInfo: CivilizationInfo) {
             )// Leave at least 1
             statMap["Treasury deficit"] = Stats(science = scienceDeficit)
         }
-        val goldDifferenceFromTrade = civInfo.diplomacy.values.sumBy { it.goldPerTurn() }
+        val goldDifferenceFromTrade = civInfo.diplomacy.values.sumOf { it.goldPerTurn() }
         if (goldDifferenceFromTrade != 0)
             statMap["Trade"] = Stats(gold = goldDifferenceFromTrade.toFloat())
 
@@ -218,7 +218,7 @@ class CivInfoStats(val civInfo: CivilizationInfo) {
 
         val happinessBonusForCityStateProvidedLuxuries =
             civInfo.getMatchingUniques("Happiness from Luxury Resources gifted by City-States increased by []%")
-                .sumBy { it.params[0].toInt() } / 100f
+                .sumOf { it.params[0].toInt() } / 100f
 
         val luxuriesProvidedByCityStates = civInfo.getKnownCivs().asSequence()
             .filter { it.isCityState() && it.getAllyCiv() == civInfo.civName }
@@ -240,7 +240,7 @@ class CivInfoStats(val civInfo: CivilizationInfo) {
         statMap["Traded Luxuries"] =
             luxuriesAllOfWhichAreTradedAway.count() * happinessPerUniqueLuxury *
                     civInfo.getMatchingUniques("Retain []% of the happiness from a luxury after the last copy has been traded away")
-                        .sumBy { it.params[0].toInt() } / 100f
+                        .sumOf { it.params[0].toInt() } / 100f
 
         for (city in civInfo.cities) {
             // There appears to be a concurrency problem? In concurrent thread in ConstructionsTable.getConstructionButtonDTOs

core/src/com/unciv/logic/civilization/CivilizationInfo.kt

@@ -1,25 +1,21 @@
 package com.unciv.logic.civilization
 
 import com.badlogic.gdx.math.Vector2
-import com.unciv.Constants
 import com.unciv.UncivGame
 import com.unciv.logic.GameInfo
 import com.unciv.logic.UncivShowableException
-import com.unciv.logic.automation.NextTurnAutomation
 import com.unciv.logic.automation.WorkerAutomation
 import com.unciv.logic.city.CityInfo
 import com.unciv.logic.civilization.RuinsManager.RuinsManager
 import com.unciv.logic.civilization.diplomacy.DiplomacyFlags
 import com.unciv.logic.civilization.diplomacy.DiplomacyManager
 import com.unciv.logic.civilization.diplomacy.DiplomaticStatus
-import com.unciv.logic.civilization.diplomacy.RelationshipLevel
 import com.unciv.logic.map.MapUnit
 import com.unciv.logic.map.TileInfo
 import com.unciv.logic.map.UnitMovementAlgorithms
 import com.unciv.logic.trade.TradeEvaluation
 import com.unciv.logic.trade.TradeRequest
 import com.unciv.models.Counter
-import com.unciv.models.metadata.GameSpeed
 import com.unciv.models.ruleset.*
 import com.unciv.models.ruleset.tile.ResourceSupplyList
 import com.unciv.models.ruleset.tile.ResourceType
@@ -27,16 +23,15 @@ import com.unciv.models.ruleset.tile.TileResource
 import com.unciv.models.ruleset.unit.BaseUnit
 import com.unciv.models.stats.Stat
 import com.unciv.models.stats.Stats
-import com.unciv.models.translations.getPlaceholderParameters
-import com.unciv.models.translations.getPlaceholderText
 import com.unciv.models.translations.tr
 import com.unciv.ui.utils.toPercent
 import com.unciv.ui.victoryscreen.RankingType
 import java.util.*
 import kotlin.collections.ArrayList
 import kotlin.collections.HashMap
-import kotlin.collections.LinkedHashMap
+import kotlin.math.min
-import kotlin.math.*
+import kotlin.math.roundToInt
+import kotlin.math.sqrt
 
 class CivilizationInfo {
 
@@ -128,7 +123,7 @@ class CivilizationInfo {
      */
     val temporaryUniques = ArrayList<Pair<Unique, Int>>()
 
-    /** Maps the name of the construction to the amount of times bouhgt */
+    /** Maps the name of the construction to the amount of times bought */
     val boughtConstructionsWithGloballyIncreasingPrice = HashMap<String, Int>()
 
     // if we only use lists, and change the list each time the cities are changed,
@@ -501,11 +496,11 @@ class CivilizationInfo {
 
     fun getStatForRanking(category: RankingType): Int {
         return when (category) {
-            RankingType.Population -> cities.sumBy { it.population.population }
+            RankingType.Population -> cities.sumOf { it.population.population }
             RankingType.Crop_Yield -> statsForNextTurn.food.roundToInt()
             RankingType.Production -> statsForNextTurn.production.roundToInt()
             RankingType.Gold -> gold
-            RankingType.Territory -> cities.sumBy { it.tiles.size }
+            RankingType.Territory -> cities.sumOf { it.tiles.size }
             RankingType.Force -> getMilitaryMight()
             RankingType.Happiness -> getHappiness()
             RankingType.Technologies -> tech.researchedTechnologies.size
@@ -842,7 +837,7 @@ class CivilizationInfo {
         val unit = getEquivalentUnit(unitName)
         val placedUnit = placeUnitNearTile(cityToAddTo.location, unit.name)
         // silently bail if no tile to place the unit is found
-        if (placedUnit == null) return null
+            ?: return null
         if (unit.isGreatPerson()) {
             addNotification("A [${unit.name}] has been born in [${cityToAddTo.name}]!", placedUnit.getTile().position, unit.name)
         }

core/src/com/unciv/logic/map/MapUnit.kt

@@ -118,7 +118,7 @@ class MapUnit {
     }
 
     fun shortDisplayName(): String {
-        return if (instanceName != null) "[$instanceName]"!!
+        return if (instanceName != null) "[$instanceName]"
             else "[$name]" 
     }
 
@@ -344,8 +344,7 @@ class MapUnit {
     }
 
     fun maxAttacksPerTurn(): Int {
-        var maxAttacksPerTurn = 1 + getMatchingUniques("[] additional attacks per turn").sumOf { it.params[0].toInt() }
+        return 1 + getMatchingUniques("[] additional attacks per turn").sumOf { it.params[0].toInt() }
-        return maxAttacksPerTurn
     }
 
     fun canAttack(): Boolean {

core/src/com/unciv/models/ruleset/Building.kt

@@ -34,7 +34,7 @@ class Building : NamedStats(), INonPerpetualConstruction, ICivilopediaText {
         // Could have old specialist values of "gold", "science" etc - change them to the new specialist names
         val counter = Counter<String>()
         for ((entry, amount) in specialistSlots!!) {
-            val equivalentStat = Stat.values().firstOrNull { it.name.toLowerCase(Locale.ENGLISH) == entry }
+            val equivalentStat = Stat.values().firstOrNull { it.name.lowercase() == entry }
 
             if (equivalentStat != null)
                 counter[Specialist.specialistNameByStat(equivalentStat)] = amount

core/src/com/unciv/models/ruleset/Ruleset.kt

@@ -415,11 +415,11 @@ class Ruleset {
                 fun getPrereqTree(technologyName: String): Set<String> {
                     if (prereqsHashMap.containsKey(technologyName)) return prereqsHashMap[technologyName]!!
                     val technology = technologies[technologyName]
-                    if (technology == null) return emptySet()
+                        ?: return emptySet()
                     val techHashSet = HashSet<String>()
                     techHashSet += technology.prerequisites
-                    for (prereq in technology.prerequisites)
+                    for (prerequisite in technology.prerequisites)
-                        techHashSet += getPrereqTree(prereq)
+                        techHashSet += getPrereqTree(prerequisite)
                     prereqsHashMap[technologyName] = techHashSet
                     return techHashSet
                 }

core/src/com/unciv/ui/map/TileGroupMap.kt

@@ -9,7 +9,13 @@ import com.unciv.ui.tilegroups.TileGroup
 import kotlin.math.max
 import kotlin.math.min
 
-class TileGroupMap<T: TileGroup>(tileGroups: Collection<T>, private val leftAndRightPadding: Float, private val topAndBottomPadding: Float, worldWrap: Boolean = false, tileGroupsToUnwrap: Collection<T>? = null): Group(){
+class TileGroupMap<T: TileGroup>(
+    tileGroups: Collection<T>,
+    private val leftAndRightPadding: Float,
+    private val topAndBottomPadding: Float,
+    worldWrap: Boolean = false,
+    tileGroupsToUnwrap: Collection<T>? = null
+): Group() {
     var topX = -Float.MAX_VALUE
     var topY = -Float.MAX_VALUE
     var bottomX = Float.MAX_VALUE
@@ -20,6 +26,7 @@ class TileGroupMap<T: TileGroup>(tileGroups: Collection<T>, private val leftAndR
     init {
         if (worldWrap) {
             for (tileGroup in tileGroups) {
+                @Suppress("UNCHECKED_CAST")  // T is constrained such that casting these TileGroup clones to T should be OK
                 mirrorTileGroups[tileGroup.tileInfo] = Pair(tileGroup.clone() as T, tileGroup.clone() as T)
             }
         }

core/src/com/unciv/ui/overviewscreen/CityOverviewTable.kt

@@ -87,11 +87,11 @@ class CityOverviewTable(private val viewingPlayer: CivilizationInfo, private val
             .minWidth(iconSize) //we need the min width so we can align the different tables
 
         cityInfoTableTotal.add("Total".toLabel())
-        cityInfoTableTotal.add(viewingPlayer.cities.sumBy { it.population.population }.toString().toLabel()).myAlign(Align.center)
+        cityInfoTableTotal.add(viewingPlayer.cities.sumOf { it.population.population }.toString().toLabel()).myAlign(Align.center)
         for (column in columnsNames.filter { it.isStat() }) {
             val stat = Stat.valueOf(column)
             if (stat == Stat.Food || stat == Stat.Production) cityInfoTableTotal.add() // an intended empty space
-            else cityInfoTableTotal.add(viewingPlayer.cities.sumBy { getStatOfCity(it, stat) }.toLabel()).myAlign(Align.center)
+            else cityInfoTableTotal.add(viewingPlayer.cities.sumOf { getStatOfCity(it, stat) }.toLabel()).myAlign(Align.center)
         }
         cityInfoTableTotal.pack()
 
@@ -111,7 +111,7 @@ class CityOverviewTable(private val viewingPlayer: CivilizationInfo, private val
     private fun getStatOfCity(cityInfo: CityInfo, stat: Stat): Int {
         return if (stat == Stat.Happiness)
              cityInfo.cityStats.happinessList.values.sum().roundToInt()
-        else cityInfo.cityStats.currentCityStats.get(stat).roundToInt()
+        else cityInfo.cityStats.currentCityStats[stat].roundToInt()
     }
 
     private fun fillCitiesTable(citiesTable: Table, sortType: String, descending: Boolean) {

core/src/com/unciv/ui/overviewscreen/ResourcesOverviewTable.kt

@@ -16,7 +16,6 @@ class ResourcesOverviewTable (
     viewingPlayer: CivilizationInfo,
     overviewScreen: EmpireOverviewScreen
 ) : Table() {
-    //val game = overviewScreen.game
 
     init {
         defaults().pad(10f)
@@ -79,7 +78,7 @@ class ResourcesOverviewTable (
 
         add("Total".toLabel())
         for (resource in resources) {
-            val sum = resourceDrilldown.filter { it.resource == resource }.sumBy { it.amount }
+            val sum = resourceDrilldown.filter { it.resource == resource }.sumOf { it.amount }
             add(sum.toLabel())
         }
     }

core/src/com/unciv/ui/pickerscreens/TechPickerScreen.kt

@@ -104,14 +104,14 @@ class TechPickerScreen(internal val civInfo: CivilizationInfo, centerOnTech: Tec
             if (!erasNamesToColumns[era]!!.contains(columnNumber)) erasNamesToColumns[era]!!.add(columnNumber)
         }
         var i = 0
-        for ((era, columns) in erasNamesToColumns) {
+        for ((era, eraColumns) in erasNamesToColumns) {
-            val columnSpan = columns.size
+            val columnSpan = eraColumns.size
             val color = if (i % 2 == 0) Color.BLUE else Color.FIREBRICK
             i++
             techTable.add(era.toLabel().addBorder(2f, color)).fill().colspan(columnSpan)
         }
 
-        for (rowIndex in 0..rows - 1) {
+        for (rowIndex in 0 until rows) {
             techTable.row().pad(5f).padRight(40f)
 
             for (columnIndex in techMatrix.indices) {
@@ -206,13 +206,13 @@ class TechPickerScreen(internal val civInfo: CivilizationInfo, centerOnTech: Tec
         }
     }
 
-    private fun selectTechnology(tech: Technology?, center: Boolean = false, switchfromWorldScreen: Boolean = true) {
+    private fun selectTechnology(tech: Technology?, center: Boolean = false, switchFromWorldScreen: Boolean = true) {
 
         val previousSelectedTech = selectedTech
         selectedTech = tech
         descriptionLabel.setText(tech?.getDescription(civInfo.gameInfo.ruleSet))
 
-        if (!switchfromWorldScreen)
+        if (!switchFromWorldScreen)
             return
 
         if (tech == null)
@@ -264,8 +264,8 @@ class TechPickerScreen(internal val civInfo: CivilizationInfo, centerOnTech: Tec
     }
     
     private fun getTechProgressLabel(techs: List<String>): String {
-        val progress = techs.sumBy { tech -> civTech.researchOfTech(tech) }
+        val progress = techs.sumOf { tech -> civTech.researchOfTech(tech) }
-        val techCost = techs.sumBy { tech -> civInfo.tech.costOfTech(tech) }
+        val techCost = techs.sumOf { tech -> civInfo.tech.costOfTech(tech) }
         return "(${progress}/${techCost})"
     }