This app provides monitoring and information features for the common freifunk user and the technical stuff of a freifunk community.
Code base is taken from a TUM Practical Course project and added here to see if Freifunk Altdorf can use it.
https://www.freifunk-altdorf.de
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31 lines
681 B
31 lines
681 B
/** |
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* Copyright (c) 2013-present, Facebook, Inc. |
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* |
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* This source code is licensed under the MIT license found in the |
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* LICENSE file in the root directory of this source tree. |
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* |
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* @providesModule countDistinct |
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* @flow |
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*/ |
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'use strict'; |
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var Set = require('./Set'); |
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var emptyFunction = require('./emptyFunction'); |
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/** |
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* Returns the count of distinct elements selected from an array. |
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*/ |
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function countDistinct<T1, T2>(iter: Iterable<T1>, selector: (item: T1) => T2): number { |
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selector = selector || emptyFunction.thatReturnsArgument; |
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var set = new Set(); |
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for (var val of iter) { |
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set.add(selector(val)); |
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} |
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return set.size; |
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} |
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module.exports = countDistinct; |