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/**
* Copyright (c) 2013-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*
* @providesModule memoizeStringOnly
* @flow
* @typechecks static-only
*/
'use strict';
/**
* Memoizes the return value of a function that accepts one string argument.
*/
function memoizeStringOnly<T>(callback: (s: string) => T): (s: string) => T {
const cache = {};
return function (string) {
if (!cache.hasOwnProperty(string)) {
cache[string] = callback.call(this, string);
}
return cache[string];
};
}
module.exports = memoizeStringOnly;
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