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- /*
- MIT License http://www.opensource.org/licenses/mit-license.php
- Author Tobias Koppers @sokra
- */
- "use strict";
- /**
- * @template K
- * @template V
- * @param {Map<K, V>} map a map
- * @param {K} key the key
- * @param {function(): V} computer compute value
- * @returns {V} value
- */
- exports.provide = (map, key, computer) => {
- const value = map.get(key);
- if (value !== undefined) return value;
- const newValue = computer();
- map.set(key, newValue);
- return newValue;
- };
|
