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0

$begingroup$

Imagine simple game:

type Combatant = 
 hp : int
 attack : int


type CombatantGroup = Combatant list
type CombatantGroups = CombatantGroup list

type Battle = 
 combatantGroups : CombatantGroups

there is some battle, in which some amount groups participate. In each group there is several combatants. Now I want to implement a function for one combatant to attack another. Due to immutability, I have to replace whole attacked target, and whole group and whole battle. If the battle was just between two participants, I could write code like this:

if target = battle.combatant1 then
 battle with combatant1 = battle.combatant1 with hp = battle.combatant1.hp - attacker.attack 
else
 battle with combatant2 = battle.combatant2 with hp = battle.combatant2.hp - attacker.attack 

which is also terrible code, I would appreciate any advice on it. But with nested collections it gets even more complicated, and event doesn't look functional to me anymore:

let containsTarget = List.contains target 
let transformCombatant combatant = if combatant = target then combatant with hp = combatant.hp - attacker.attack else combatant 
let transformGroup = List.map transformCombatant 
let checkGroup group =
 if group |> containsTarget then
 group |> transformGroup
 else
 group 
let transformGroups = List.map checkGroup

 battle with combatantGroups = transformGroups battle.combatantGroups 

Can you please give me advise on how can I use features of F# and functional programming, to make given code more pretty and concise?

.net functional-programming f#

share

asked 4 mins ago

Dmitry PavlushinDmitry Pavlushin

1011

New contributor

Dmitry Pavlushin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

$endgroup$

add a comment | 

0

$begingroup$

Imagine simple game:

type Combatant = 
 hp : int
 attack : int


type CombatantGroup = Combatant list
type CombatantGroups = CombatantGroup list

type Battle = 
 combatantGroups : CombatantGroups

there is some battle, in which some amount groups participate. In each group there is several combatants. Now I want to implement a function for one combatant to attack another. Due to immutability, I have to replace whole attacked target, and whole group and whole battle. If the battle was just between two participants, I could write code like this:

if target = battle.combatant1 then
 battle with combatant1 = battle.combatant1 with hp = battle.combatant1.hp - attacker.attack 
else
 battle with combatant2 = battle.combatant2 with hp = battle.combatant2.hp - attacker.attack 

which is also terrible code, I would appreciate any advice on it. But with nested collections it gets even more complicated, and event doesn't look functional to me anymore:

let containsTarget = List.contains target 
let transformCombatant combatant = if combatant = target then combatant with hp = combatant.hp - attacker.attack else combatant 
let transformGroup = List.map transformCombatant 
let checkGroup group =
 if group |> containsTarget then
 group |> transformGroup
 else
 group 
let transformGroups = List.map checkGroup

 battle with combatantGroups = transformGroups battle.combatantGroups 

Can you please give me advise on how can I use features of F# and functional programming, to make given code more pretty and concise?

.net functional-programming f#

share

asked 4 mins ago

Dmitry PavlushinDmitry Pavlushin

1011

New contributor

Dmitry Pavlushin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

$endgroup$

add a comment | 

$begingroup$

Imagine simple game:

type Combatant = 
 hp : int
 attack : int


type CombatantGroup = Combatant list
type CombatantGroups = CombatantGroup list

type Battle = 
 combatantGroups : CombatantGroups

there is some battle, in which some amount groups participate. In each group there is several combatants. Now I want to implement a function for one combatant to attack another. Due to immutability, I have to replace whole attacked target, and whole group and whole battle. If the battle was just between two participants, I could write code like this:

if target = battle.combatant1 then
 battle with combatant1 = battle.combatant1 with hp = battle.combatant1.hp - attacker.attack 
else
 battle with combatant2 = battle.combatant2 with hp = battle.combatant2.hp - attacker.attack 

which is also terrible code, I would appreciate any advice on it. But with nested collections it gets even more complicated, and event doesn't look functional to me anymore:

let containsTarget = List.contains target 
let transformCombatant combatant = if combatant = target then combatant with hp = combatant.hp - attacker.attack else combatant 
let transformGroup = List.map transformCombatant 
let checkGroup group =
 if group |> containsTarget then
 group |> transformGroup
 else
 group 
let transformGroups = List.map checkGroup

 battle with combatantGroups = transformGroups battle.combatantGroups 

Can you please give me advise on how can I use features of F# and functional programming, to make given code more pretty and concise?

.net functional-programming f#

share

asked 4 mins ago

Dmitry PavlushinDmitry Pavlushin

1011

New contributor

Dmitry Pavlushin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

$endgroup$

type Combatant = 
 hp : int
 attack : int


type CombatantGroup = Combatant list
type CombatantGroups = CombatantGroup list

type Battle = 
 combatantGroups : CombatantGroups

if target = battle.combatant1 then
 battle with combatant1 = battle.combatant1 with hp = battle.combatant1.hp - attacker.attack 
else
 battle with combatant2 = battle.combatant2 with hp = battle.combatant2.hp - attacker.attack 

let containsTarget = List.contains target 
let transformCombatant combatant = if combatant = target then combatant with hp = combatant.hp - attacker.attack else combatant 
let transformGroup = List.map transformCombatant 
let checkGroup group =
 if group |> containsTarget then
 group |> transformGroup
 else
 group 
let transformGroups = List.map checkGroup

 battle with combatantGroups = transformGroups battle.combatantGroups 

share

asked 4 mins ago

Dmitry PavlushinDmitry Pavlushin

1011

New contributor

Dmitry Pavlushin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share

asked 4 mins ago

Dmitry PavlushinDmitry Pavlushin

1011

New contributor

Dmitry Pavlushin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 4 mins ago

Dmitry PavlushinDmitry Pavlushin

1011

New contributor

Dmitry Pavlushin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 4 mins ago

Dmitry PavlushinDmitry Pavlushin

1011