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 anObject = require('../internals/an-object');
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5 | var bind = require('../internals/bind-context');
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6 | var getMapIterator = require('../internals/get-map-iterator');
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7 | var iterate = require('../internals/iterate');
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8 |
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9 |
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10 |
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11 | $({ target: 'Map', proto: true, real: true, forced: IS_PURE }, {
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12 | findKey: function findKey(callbackfn /* , thisArg */) {
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13 | var map = anObject(this);
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14 | var iterator = getMapIterator(map);
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15 | var boundFunction = bind(callbackfn, arguments.length > 1 ? arguments[1] : undefined, 3);
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16 | return iterate(iterator, function (key, value) {
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17 | if (boundFunction(value, key, map)) return iterate.stop(key);
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18 | }, undefined, true, true).result;
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19 | }
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20 | });
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