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Last change
on this file was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
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initial commit
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472 bytes
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| 1 | /*
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| 2 | MIT License http://www.opensource.org/licenses/mit-license.php
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| 3 | Author Tobias Koppers @sokra
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| 4 | */
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| 5 |
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| 6 | "use strict";
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| 7 |
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| 8 | /**
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| 9 | * @template K
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| 10 | * @template V
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| 11 | * @param {Map<K, V>} map a map
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| 12 | * @param {K} key the key
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| 13 | * @param {function(): V} computer compute value
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| 14 | * @returns {V} value
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| 15 | */
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| 16 | exports.provide = (map, key, computer) => {
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| 17 | const value = map.get(key);
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| 18 | if (value !== undefined) return value;
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| 19 | const newValue = computer();
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| 20 | map.set(key, newValue);
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| 21 | return newValue;
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| 22 | };
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