Sha256: 74aefac852eaa7afa81c8abf8c29b888290df705c55fc65f7757a1ff263f8288
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Size: 1.34 KB
Versions: 31
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Stored size: 1.34 KB
Contents
'use strict';
var GetIntrinsic = require('get-intrinsic');
var callBound = require('call-bind/callBound');
var $TypeError = GetIntrinsic('%TypeError%');
var $charAt = callBound('String.prototype.charAt');
var isString = require('is-string');
var isNegativeZero = require('is-negative-zero');
var unbox = require('unbox-primitive');
var CanonicalNumericIndexString = require('./CanonicalNumericIndexString');
var IsInteger = require('./IsInteger');
var IsPropertyKey = require('./IsPropertyKey');
var Type = require('./Type');
// 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 (Type(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
};
};
Version data entries
31 entries across 30 versions & 4 rubygems