1 | 'use strict';
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2 | var $ = require('../internals/export');
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3 | var toAbsoluteIndex = require('../internals/to-absolute-index');
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4 | var toInteger = require('../internals/to-integer');
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5 | var toLength = require('../internals/to-length');
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6 | var toObject = require('../internals/to-object');
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7 | var arraySpeciesCreate = require('../internals/array-species-create');
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8 | var createProperty = require('../internals/create-property');
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9 | var arrayMethodHasSpeciesSupport = require('../internals/array-method-has-species-support');
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10 | var arrayMethodUsesToLength = require('../internals/array-method-uses-to-length');
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11 |
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12 | var HAS_SPECIES_SUPPORT = arrayMethodHasSpeciesSupport('splice');
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13 | var USES_TO_LENGTH = arrayMethodUsesToLength('splice', { ACCESSORS: true, 0: 0, 1: 2 });
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14 |
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15 | var max = Math.max;
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16 | var min = Math.min;
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17 | var MAX_SAFE_INTEGER = 0x1FFFFFFFFFFFFF;
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18 | var MAXIMUM_ALLOWED_LENGTH_EXCEEDED = 'Maximum allowed length exceeded';
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19 |
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20 |
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21 |
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22 |
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23 | $({ target: 'Array', proto: true, forced: !HAS_SPECIES_SUPPORT || !USES_TO_LENGTH }, {
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24 | splice: function splice(start, deleteCount /* , ...items */) {
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25 | var O = toObject(this);
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26 | var len = toLength(O.length);
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27 | var actualStart = toAbsoluteIndex(start, len);
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28 | var argumentsLength = arguments.length;
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29 | var insertCount, actualDeleteCount, A, k, from, to;
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30 | if (argumentsLength === 0) {
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31 | insertCount = actualDeleteCount = 0;
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32 | } else if (argumentsLength === 1) {
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33 | insertCount = 0;
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34 | actualDeleteCount = len - actualStart;
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35 | } else {
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36 | insertCount = argumentsLength - 2;
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37 | actualDeleteCount = min(max(toInteger(deleteCount), 0), len - actualStart);
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38 | }
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39 | if (len + insertCount - actualDeleteCount > MAX_SAFE_INTEGER) {
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40 | throw TypeError(MAXIMUM_ALLOWED_LENGTH_EXCEEDED);
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41 | }
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42 | A = arraySpeciesCreate(O, actualDeleteCount);
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43 | for (k = 0; k < actualDeleteCount; k++) {
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44 | from = actualStart + k;
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45 | if (from in O) createProperty(A, k, O[from]);
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46 | }
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47 | A.length = actualDeleteCount;
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48 | if (insertCount < actualDeleteCount) {
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49 | for (k = actualStart; k < len - actualDeleteCount; k++) {
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50 | from = k + actualDeleteCount;
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51 | to = k + insertCount;
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52 | if (from in O) O[to] = O[from];
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53 | else delete O[to];
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54 | }
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55 | for (k = len; k > len - actualDeleteCount + insertCount; k--) delete O[k - 1];
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56 | } else if (insertCount > actualDeleteCount) {
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57 | for (k = len - actualDeleteCount; k > actualStart; k--) {
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58 | from = k + actualDeleteCount - 1;
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59 | to = k + insertCount - 1;
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60 | if (from in O) O[to] = O[from];
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61 | else delete O[to];
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62 | }
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63 | }
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64 | for (k = 0; k < insertCount; k++) {
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65 | O[k + actualStart] = arguments[k + 2];
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66 | }
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67 | O.length = len - actualDeleteCount + insertCount;
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68 | return A;
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69 | }
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70 | });
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