55 lines
1.6 KiB
JavaScript
55 lines
1.6 KiB
JavaScript
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'use strict';
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var bind = require('function-bind');
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var ES2016 = require('./es2016');
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var assign = require('./helpers/assign');
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var forEach = require('./helpers/forEach');
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var GetIntrinsic = require('./GetIntrinsic');
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var $TypeError = GetIntrinsic('%TypeError%');
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var $isEnumerable = bind.call(Function.call, GetIntrinsic('%ObjectPrototype%').propertyIsEnumerable);
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var $pushApply = bind.call(Function.apply, GetIntrinsic('%ArrayPrototype%').push);
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var ES2017 = assign(assign({}, ES2016), {
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ToIndex: function ToIndex(value) {
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if (typeof value === 'undefined') {
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return 0;
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}
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var integerIndex = this.ToInteger(value);
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if (integerIndex < 0) {
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throw new RangeError('index must be >= 0');
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}
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var index = this.ToLength(integerIndex);
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if (!this.SameValueZero(integerIndex, index)) {
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throw new RangeError('index must be >= 0 and < 2 ** 53 - 1');
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}
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return index;
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},
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// https://www.ecma-international.org/ecma-262/8.0/#sec-enumerableownproperties
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EnumerableOwnProperties: function EnumerableOwnProperties(O, kind) {
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var keys = ES2016.EnumerableOwnNames(O);
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if (kind === 'key') {
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return keys;
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}
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if (kind === 'value' || kind === 'key+value') {
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var results = [];
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forEach(keys, function (key) {
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if ($isEnumerable(O, key)) {
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$pushApply(results, [
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kind === 'value' ? O[key] : [key, O[key]]
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]);
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}
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});
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return results;
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}
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throw new $TypeError('Assertion failed: "kind" is not "key", "value", or "key+value": ' + kind);
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}
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});
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delete ES2017.EnumerableOwnNames; // replaced with EnumerableOwnProperties
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module.exports = ES2017;
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