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20 lines
534 B
20 lines
534 B
'use strict'; |
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var $RangeError = require('es-errors/range'); |
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var ToIntegerOrInfinity = require('./ToIntegerOrInfinity'); |
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var MAX_SAFE_INTEGER = require('math-intrinsics/constants/maxSafeInteger'); |
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// https://262.ecma-international.org/15.0/#sec-toindex |
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module.exports = 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 integer = ToIntegerOrInfinity(value); |
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if (integer < 0 || integer >= MAX_SAFE_INTEGER) { |
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throw new $RangeError('index must be >= 0 and < 2 ** 53 - 1'); |
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} |
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return integer; |
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};
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