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Editing: es.array.slice.js

'use strict';
var $ = require('../internals/export');
var isArray = require('../internals/is-array');
var isConstructor = require('../internals/is-constructor');
var isObject = require('../internals/is-object');
var toAbsoluteIndex = require('../internals/to-absolute-index');
var lengthOfArrayLike = require('../internals/length-of-array-like');
var toIndexedObject = require('../internals/to-indexed-object');
var createProperty = require('../internals/create-property');
var wellKnownSymbol = require('../internals/well-known-symbol');
var arrayMethodHasSpeciesSupport = require('../internals/array-method-has-species-support');
var nativeSlice = require('../internals/array-slice');

var HAS_SPECIES_SUPPORT = arrayMethodHasSpeciesSupport('slice');

var SPECIES = wellKnownSymbol('species');
var $Array = Array;
var max = Math.max;

// `Array.prototype.slice` method
// https://tc39.es/ecma262/#sec-array.prototype.slice
// fallback for not array-like ES3 strings and DOM objects
$({ target: 'Array', proto: true, forced: !HAS_SPECIES_SUPPORT }, {
  slice: function slice(start, end) {
    var O = toIndexedObject(this);
    var length = lengthOfArrayLike(O);
    var k = toAbsoluteIndex(start, length);
    var fin = toAbsoluteIndex(end === undefined ? length : end, length);
    // inline `ArraySpeciesCreate` for usage native `Array#slice` where it's possible
    var Constructor, result, n;
    if (isArray(O)) {
      Constructor = O.constructor;
      // cross-realm fallback
      if (isConstructor(Constructor) && (Constructor === $Array || isArray(Constructor.prototype))) {
        Constructor = undefined;
      } else if (isObject(Constructor)) {
        Constructor = Constructor[SPECIES];
        if (Constructor === null) Constructor = undefined;
      }
      if (Constructor === $Array || Constructor === undefined) {
        return nativeSlice(O, k, fin);
      }
    }
    result = new (Constructor === undefined ? $Array : Constructor)(max(fin - k, 0));
    for (n = 0; k < fin; k++, n++) if (k in O) createProperty(result, n, O[k]);
    result.length = n;
    return result;
  }
});

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