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'use strict';

var bind = require('function-bind');

var ES2016 = require('./es2016');
var assign = require('./helpers/assign');
var forEach = require('./helpers/forEach');

var GetIntrinsic = require('./GetIntrinsic');

var $TypeError = GetIntrinsic('%TypeError%');
var $isEnumerable = bind.call(Function.call, GetIntrinsic('%ObjectPrototype%').propertyIsEnumerable);
var $pushApply = bind.call(Function.apply, GetIntrinsic('%ArrayPrototype%').push);

var ES2017 = assign(assign({}, ES2016), {
	ToIndex: function ToIndex(value) {
		if (typeof value === 'undefined') {
			return 0;
		}
		var integerIndex = this.ToInteger(value);
		if (integerIndex < 0) {
			throw new RangeError('index must be >= 0');
		}
		var index = this.ToLength(integerIndex);
		if (!this.SameValueZero(integerIndex, index)) {
			throw new RangeError('index must be >= 0 and < 2 ** 53 - 1');
		}
		return index;
	},

	// https://www.ecma-international.org/ecma-262/8.0/#sec-enumerableownproperties
	EnumerableOwnProperties: function EnumerableOwnProperties(O, kind) {
		var keys = ES2016.EnumerableOwnNames(O);
		if (kind === 'key') {
			return keys;
		}
		if (kind === 'value' || kind === 'key+value') {
			var results = [];
			forEach(keys, function (key) {
				if ($isEnumerable(O, key)) {
					$pushApply(results, [
						kind === 'value' ? O[key] : [key, O[key]]
					]);
				}
			});
			return results;
		}
		throw new $TypeError('Assertion failed: "kind" is not "key", "value", or "key+value": ' + kind);
	}
});

delete ES2017.EnumerableOwnNames; // replaced with EnumerableOwnProperties

module.exports = ES2017;