main
Last change
on this file was d565449, checked in by stefan toskovski <stefantoska84@…>, 4 weeks ago |
Update repo after prototype presentation
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100644
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File size:
1.2 KB
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1 | 'use strict';
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2 |
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3 | var $TypeError = require('es-errors/type');
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4 |
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5 | var IsPropertyKey = require('./IsPropertyKey');
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6 | var SameValue = require('./SameValue');
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7 | var Type = require('./Type');
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8 |
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9 | // IE 9 does not throw in strict mode when writability/configurability/extensibility is violated
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10 | var noThrowOnStrictViolation = (function () {
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11 | try {
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12 | delete [].length;
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13 | return true;
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14 | } catch (e) {
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15 | return false;
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16 | }
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17 | }());
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18 |
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19 | // https://262.ecma-international.org/6.0/#sec-set-o-p-v-throw
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20 |
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21 | module.exports = function Set(O, P, V, Throw) {
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22 | if (Type(O) !== 'Object') {
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23 | throw new $TypeError('Assertion failed: `O` must be an Object');
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24 | }
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25 | if (!IsPropertyKey(P)) {
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26 | throw new $TypeError('Assertion failed: `P` must be a Property Key');
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27 | }
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28 | if (typeof Throw !== 'boolean') {
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29 | throw new $TypeError('Assertion failed: `Throw` must be a Boolean');
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30 | }
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31 | if (Throw) {
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32 | O[P] = V; // eslint-disable-line no-param-reassign
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33 | if (noThrowOnStrictViolation && !SameValue(O[P], V)) {
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34 | throw new $TypeError('Attempted to assign to readonly property.');
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35 | }
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36 | return true;
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37 | }
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38 | try {
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39 | O[P] = V; // eslint-disable-line no-param-reassign
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40 | return noThrowOnStrictViolation ? SameValue(O[P], V) : true;
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41 | } catch (e) {
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42 | return false;
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43 | }
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44 |
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45 | };
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