Using Hashes

Problem

In LS we prefer using hashes where we can instead of string comparisons. This is what the game does too, number comparison is faster and more reliable.

In our case Hash is unsigned int number built from certain string. There are several hash methods available:

• Game.fnvhash
• Game.HashStringSDBM
• Game.spelldataHash

Solution

• Use appropriate hash methods where you can.
• Avoid calculating hashes in your loop. Instead define them once on script initialization.
• Avoid hardcoding hashes. For better readability of your code just get hash from string using appropriate hash method.

Examples

Game.fnvhash(str)

Used in buffs, DrawEffectCircle, other production ready Renderer functions, SpellData, etc.

Check for Annie passive buff

local hash_AnniePassivePrimed = Game.fnvhash("anniepassiveprimed")
local buff = Game.localPlayer:FindBuff(hash_AnniePassivePrimed)

Game.HashStringSDBM(str)

Used in AIBaseClient.hash, etc.

This condition is true

local match = Game.HashStringSDBM(Game.localPlayer.charName) == Game.localPlayer.hash

Get Lulu's Faerie

local function GetFaerie()
    local hash_LuluFaerie = Game.HashStringSDBM("lulufaerie")
    for _, obj in ObjectManager.allAIBaseClients:pairs() do
        if obj:IsValid() and obj.team == caster.team and obj.hash == LuluFaerieHash then
            return obj
        end
    end
end

Game.spelldataHash(str)

Used in DamageLib maps.

Get Irelia Q Damage

local hash_IreliaQ = Game.spelldataHash("IreliaQ")
local function GetQDamage(target)
    return DamageLib.GetSpellDamage(hash_IreliaQ, Game.localPlayer, target, false, 0, SpellSlot.Q)
end