Marc Mintel
5397309103
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18 lines
484 B
Plaintext
18 lines
484 B
Plaintext
let weakMemoize = function <Arg extends object, Return>(
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func: (arg: Arg) => Return
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): (arg: Arg) => Return {
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let cache = new WeakMap<Arg, Return>()
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return (arg: Arg) => {
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if (cache.has(arg)) {
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// Use non-null assertion because we just checked that the cache `has` it
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// This allows us to remove `undefined` from the return value
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return cache.get(arg)!
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}
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let ret = func(arg)
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cache.set(arg, ret)
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return ret
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}
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}
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export default weakMemoize
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