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40 lines
1.1 KiB
JavaScript
40 lines
1.1 KiB
JavaScript
/**
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* Copyright 2013 Facebook, Inc.
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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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* @providesModule memoizeStringOnly
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* @typechecks static-only
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*/
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"use strict";
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/**
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* Memoizes the return value of a function that accepts one string argument.
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*
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* @param {function} callback
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* @return {function}
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*/
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function memoizeStringOnly(callback) {
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var cache = {};
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return function(string) {
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if (cache.hasOwnProperty(string)) {
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return cache[string];
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} else {
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return cache[string] = callback.call(this, string);
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}
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};
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}
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module.exports = memoizeStringOnly;
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