40 lines
1.4 KiB
JavaScript
40 lines
1.4 KiB
JavaScript
"use strict";
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/**
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* Copyright 2023 Google LLC.
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* Copyright (c) Microsoft Corporation.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.DefaultMap = void 0;
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/**
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* A subclass of Map whose functionality is almost the same as its parent
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* except for the fact that DefaultMap never returns undefined. It provides a
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* default value for keys that do not exist.
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*/
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class DefaultMap extends Map {
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/** The default value to return whenever a key is not present in the map. */
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#getDefaultValue;
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constructor(getDefaultValue, entries) {
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super(entries);
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this.#getDefaultValue = getDefaultValue;
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}
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get(key) {
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if (!this.has(key)) {
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this.set(key, this.#getDefaultValue(key));
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}
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return super.get(key);
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}
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}
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exports.DefaultMap = DefaultMap;
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//# sourceMappingURL=DefaultMap.js.map
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