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/**
* Copyright (c) 2013-present, Facebook, Inc.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
*
*/
'use strict';
var emptyFunction = require("./emptyFunction");
/**
* Returns the count of distinct elements selected from an array.
*/
function countDistinct(iter, selector) {
selector = selector || emptyFunction.thatReturnsArgument;
var set = new Set();
var _iteratorNormalCompletion = true;
var _didIteratorError = false;
var _iteratorError = undefined;
try {
for (var _iterator = iter[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {
var val = _step.value;
set.add(selector(val));
}
} catch (err) {
_didIteratorError = true;
_iteratorError = err;
} finally {
try {
if (!_iteratorNormalCompletion && _iterator["return"] != null) {
_iterator["return"]();
}
} finally {
if (_didIteratorError) {
throw _iteratorError;
}
}
}
return set.size;
}
module.exports = countDistinct;
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