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26 lines
657 B
26 lines
657 B
'use strict'; |
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var GetIntrinsic = require('get-intrinsic'); |
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var $RangeError = GetIntrinsic('%RangeError%'); |
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var ToInteger = require('./ToInteger'); |
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var ToLength = require('./ToLength'); |
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var SameValue = require('./SameValue'); |
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// https://262.ecma-international.org/12.0/#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 integerIndex = 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 = ToLength(integerIndex); |
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if (!SameValue(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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