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perf(reactivity): only call Set.add if doesn't already have value (#3307)

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zhufengzhufeng 2021-02-26 03:57:35 +08:00 committed by GitHub
parent 5ad4036e29
commit 9cd988342c
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1 changed files with 1 additions and 1 deletions
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packages/reactivity/src/collectionHandlers.ts
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@ -76,8 +76,8 @@ function add(this: SetTypes, value: unknown) {
const target = toRaw(this) const target = toRaw(this)
const proto = getProto(target) const proto = getProto(target)
const hadKey = proto.has.call(target, value) const hadKey = proto.has.call(target, value)
target.add(value)
if (!hadKey) { if (!hadKey) {
target.add(value)
trigger(target, TriggerOpTypes.ADD, value, value) trigger(target, TriggerOpTypes.ADD, value, value)
} }
return this return this