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node_modules/es-abstract/2015/StringGetIndexProperty.js
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1lostsun
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05 май 2025, 11:35
05 май 2025, 11:35
fe8f535
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'use strict'; var callBound = require('call-bound'); var $TypeError = require('es-errors/type'); var $charAt = callBound('String.prototype.charAt'); var isString = require('is-string'); var isNegativeZero = require('math-intrinsics/isNegativeZero'); var unbox = require('unbox-primitive'); var CanonicalNumericIndexString = require('./CanonicalNumericIndexString'); var IsInteger = require('./IsInteger'); var isPropertyKey = require('../helpers/isPropertyKey'); // https://262.ecma-international.org/6.0/#sec-stringgetindexproperty module.exports = function StringGetIndexProperty(S, P) { if (typeof S === 'string' || !isString(S)) { throw new $TypeError('Assertion failed: `S` must be a boxed String Object'); } if (!isPropertyKey(P)) { throw new $TypeError('Assertion failed: `P` must be a Property Key'); } if (typeof P !== 'string') { return void undefined; } var index = CanonicalNumericIndexString(P); if (typeof index === 'undefined' || !IsInteger(index) || isNegativeZero(index)) { return void undefined; } var str = unbox(S); var len = str.length; if (index < 0 || len <= index) { return void undefined; } var resultStr = $charAt(str, index); return { '[[Configurable]]': false, '[[Enumerable]]': true, '[[Value]]': resultStr, '[[Writable]]': false }; };