35 lines
649 B
JavaScript
35 lines
649 B
JavaScript
/**
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* Memoizes the provided three-argument function.
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*/
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export function memoize3(fn) {
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let cache0;
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return function memoized(a1, a2, a3) {
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if (cache0 === undefined) {
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cache0 = new WeakMap();
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}
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let cache1 = cache0.get(a1);
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if (cache1 === undefined) {
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cache1 = new WeakMap();
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cache0.set(a1, cache1);
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}
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let cache2 = cache1.get(a2);
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if (cache2 === undefined) {
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cache2 = new WeakMap();
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cache1.set(a2, cache2);
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}
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let fnResult = cache2.get(a3);
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if (fnResult === undefined) {
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fnResult = fn(a1, a2, a3);
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cache2.set(a3, fnResult);
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}
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return fnResult;
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};
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}
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