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32 lines
604 B
32 lines
604 B
/* |
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MIT License http://www.opensource.org/licenses/mit-license.php |
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*/ |
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"use strict"; |
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/** @template T @typedef {function(): T} FunctionReturning */ |
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/** |
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* @template T |
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* @param {FunctionReturning<T>} fn memorized function |
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* @returns {FunctionReturning<T>} new function |
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*/ |
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const memoize = fn => { |
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let cache = false; |
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/** @type {T} */ |
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let result = undefined; |
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return () => { |
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if (cache) { |
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return result; |
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} else { |
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result = fn(); |
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cache = true; |
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// Allow to clean up memory for fn |
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// and all dependent resources |
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fn = undefined; |
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return result; |
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} |
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}; |
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}; |
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module.exports = memoize;
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