mirror of
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23 lines
656 B
JavaScript
23 lines
656 B
JavaScript
'use strict';
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var GetIntrinsic = require('../GetIntrinsic');
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var $TypeError = GetIntrinsic('%TypeError%');
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var SameValue = require('./SameValue');
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var ToNumber = require('./ToNumber');
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var ToString = require('./ToString');
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var Type = require('./Type');
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// https://ecma-international.org/ecma-262/6.0/#sec-canonicalnumericindexstring
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module.exports = function CanonicalNumericIndexString(argument) {
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if (Type(argument) !== 'String') {
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throw new $TypeError('Assertion failed: `argument` must be a String');
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}
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if (argument === '-0') { return -0; }
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var n = ToNumber(argument);
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if (SameValue(ToString(n), argument)) { return n; }
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return void 0;
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};
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