c177363a19
🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
47 lines
1.3 KiB
JavaScript
47 lines
1.3 KiB
JavaScript
'use strict';
|
|
|
|
var $TypeError = require('es-errors/type');
|
|
var isNegativeZero = require('math-intrinsics/isNegativeZero');
|
|
var isObject = require('es-object-atoms/isObject');
|
|
|
|
var callBound = require('call-bound');
|
|
var $charAt = callBound('String.prototype.charAt');
|
|
var $stringToString = callBound('String.prototype.toString');
|
|
|
|
var CanonicalNumericIndexString = require('./CanonicalNumericIndexString');
|
|
|
|
var isPropertyKey = require('../helpers/isPropertyKey');
|
|
var isInteger = require('math-intrinsics/isInteger');
|
|
|
|
// https://262.ecma-international.org/12.0/#sec-stringgetownproperty
|
|
|
|
module.exports = function StringGetOwnProperty(S, P) {
|
|
var str;
|
|
if (isObject(S)) {
|
|
try {
|
|
str = $stringToString(S);
|
|
} catch (e) { /**/ }
|
|
}
|
|
if (typeof str !== 'string') {
|
|
throw new $TypeError('Assertion failed: `S` must be a boxed string object');
|
|
}
|
|
if (!isPropertyKey(P)) {
|
|
throw new $TypeError('Assertion failed: P is not a Property Key');
|
|
}
|
|
if (typeof P !== 'string') {
|
|
return void undefined;
|
|
}
|
|
var index = CanonicalNumericIndexString(P);
|
|
var len = str.length;
|
|
if (typeof index === 'undefined' || !isInteger(index) || isNegativeZero(index) || index < 0 || len <= index) {
|
|
return void undefined;
|
|
}
|
|
var resultStr = $charAt(S, index);
|
|
return {
|
|
'[[Configurable]]': false,
|
|
'[[Enumerable]]': true,
|
|
'[[Value]]': resultStr,
|
|
'[[Writable]]': false
|
|
};
|
|
};
|