1 | 'use strict';
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2 | var $ = require('../internals/export');
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3 | var IS_PURE = require('../internals/is-pure');
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4 | var getBuiltIn = require('../internals/get-built-in');
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5 | var anObject = require('../internals/an-object');
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6 | var aFunction = require('../internals/a-function');
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7 | var bind = require('../internals/bind-context');
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8 | var speciesConstructor = require('../internals/species-constructor');
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9 | var getMapIterator = require('../internals/get-map-iterator');
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10 | var iterate = require('../internals/iterate');
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11 |
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12 |
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13 |
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14 | $({ target: 'Map', proto: true, real: true, forced: IS_PURE }, {
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15 | filter: function filter(callbackfn /* , thisArg */) {
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16 | var map = anObject(this);
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17 | var iterator = getMapIterator(map);
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18 | var boundFunction = bind(callbackfn, arguments.length > 1 ? arguments[1] : undefined, 3);
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19 | var newMap = new (speciesConstructor(map, getBuiltIn('Map')))();
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20 | var setter = aFunction(newMap.set);
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21 | iterate(iterator, function (key, value) {
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22 | if (boundFunction(value, key, map)) setter.call(newMap, key, value);
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23 | }, undefined, true, true);
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24 | return newMap;
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25 | }
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26 | });
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