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fix: remove old keys when updating key in mapped()

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littensy 2026-03-27 04:39:02 -07:00
parent 81d547ae82
commit e426e76ff1
2 changed files with 64 additions and 29 deletions
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21
packages/charm/test/mapped.test.luau
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@ -104,4 +104,25 @@ test("should map keys", function()
assert(state.D == 4, "should add d")
end)
test("should remove old key if mapper returns a new key", function()
local src, setSrc = signal({ 1 })
local map = mapped(src, function(value: number, index: number)
return true, `{index}={value}`
end)
local state = map()
assert(state["1=1"], "should have mapped first element to key 1=1")
setSrc({ 2 })
state = map()
assert(state["1=1"] == nil, "should have removed old key 1=1")
assert(state["1=2"], "should have remapped element to key 1=2")
setSrc({ 3, 1 })
state = map()
assert(state["1=2"] == nil, "should have removed old key 1=2")
assert(state["1=3"], "should have remapped element to key 1=3")
assert(state["2=1"], "should have mapped second element to key 2=1")
end)
return {}