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30 lines
689 B
30 lines
689 B
'use strict'; |
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var $TypeError = require('es-errors/type'); |
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var forEach = require('../helpers/forEach'); |
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var isArray = require('../helpers/IsArray'); |
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// https://262.ecma-international.org/16.0/#sec-setdatasize |
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// TODO: when spec enums are unforgeable, uncomment ~EMPTY~ check |
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module.exports = function SetDataSize(setData) { |
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if (!isArray(setData) && setData !== 'EMPTY') { |
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throw new $TypeError('Assertion failed: `setData` must be a List or ~EMPTY~'); |
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} |
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if (setData === 'EMPTY') { |
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return 0; |
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} |
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var count = 0; // step 1 |
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forEach(setData, function (e, i) { // step 2 |
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if (i in setData /* && e !== ~EMPTY~ */) { |
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count += 1; // step 2.a |
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} |
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}); |
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return count; // step 3 |
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};
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