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34 lines
649 B
34 lines
649 B
/** |
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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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