1 | 'use strict';
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2 | var $ = require('../internals/export');
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3 | var $findIndex = require('../internals/array-iteration').findIndex;
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4 | var addToUnscopables = require('../internals/add-to-unscopables');
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5 | var arrayMethodUsesToLength = require('../internals/array-method-uses-to-length');
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6 |
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7 | var FIND_INDEX = 'findIndex';
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8 | var SKIPS_HOLES = true;
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9 |
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10 | var USES_TO_LENGTH = arrayMethodUsesToLength(FIND_INDEX);
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11 |
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12 |
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13 | if (FIND_INDEX in []) Array(1)[FIND_INDEX](function () { SKIPS_HOLES = false; });
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14 |
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15 |
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16 |
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17 | $({ target: 'Array', proto: true, forced: SKIPS_HOLES || !USES_TO_LENGTH }, {
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18 | findIndex: function findIndex(callbackfn /* , that = undefined */) {
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19 | return $findIndex(this, callbackfn, arguments.length > 1 ? arguments[1] : undefined);
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20 | }
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21 | });
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22 |
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23 |
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24 | addToUnscopables(FIND_INDEX);
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