main
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Last change
on this file since d565449 was d565449, checked in by stefan toskovski <stefantoska84@…>, 4 weeks ago |
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Update repo after prototype presentation
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Property mode
set to
100644
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File size:
990 bytes
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| [d565449] | 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 DefinePropertyOrThrow = require('./DefinePropertyOrThrow');
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| 6 | var HasOwnProperty = require('./HasOwnProperty');
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| 7 | var IsExtensible = require('./IsExtensible');
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| 8 | var IsNonNegativeInteger = require('./IsNonNegativeInteger');
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| 9 |
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| 10 | // https://262.ecma-international.org/11.0/#sec-setfunctionlength
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| 11 |
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| 12 | module.exports = function SetFunctionLength(F, length) {
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| 13 | if (typeof F !== 'function' || !IsExtensible(F) || HasOwnProperty(F, 'length')) {
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| 14 | throw new $TypeError('Assertion failed: `F` must be an extensible function and lack an own `length` property');
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| 15 | }
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| 16 | if (typeof length !== 'number') {
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| 17 | throw new $TypeError('Assertion failed: `length` must be a Number');
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| 18 | }
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| 19 | if (!IsNonNegativeInteger(length)) {
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| 20 | throw new $TypeError('Assertion failed: `length` must be an integer >= 0');
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| 21 | }
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| 22 | return DefinePropertyOrThrow(F, 'length', {
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| 23 | '[[Configurable]]': true,
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| 24 | '[[Enumerable]]': false,
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| 25 | '[[Value]]': length,
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| 26 | '[[Writable]]': false
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| 27 | });
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| 28 | };
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