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lib/util/MapHelpers.js
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alexander-akait
refactor: improve eslint configuration and better types
12 мар 2025, 04:56
12 мар 2025, 04:56
a1df00d
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/* MIT License http://www.opensource.org/licenses/mit-license.php Author Tobias Koppers @sokra */ "use strict"; /** * getOrInsert is a helper function for maps that allows you to get a value * from a map if it exists, or insert a new value if it doesn't. If it value doesn't * exist, it will be computed by the provided function. * @template K * @template V * @param {Map<K, V>} map The map object to check * @param {K} key The key to check * @param {() => V} computer function which will compute the value if it doesn't exist * @returns {V} The value from the map, or the computed value * @example * ```js * const map = new Map(); * const value = getOrInsert(map, "key", () => "value"); * console.log(value); // "value" * ``` */ module.exports.getOrInsert = (map, key, computer) => { // Grab key from map const value = map.get(key); // If the value already exists, return it if (value !== undefined) return value; // Otherwise compute the value, set it in the map, and return it const newValue = computer(); map.set(key, newValue); return newValue; };