44 lines
854 B
JavaScript
44 lines
854 B
JavaScript
'use strict';
|
|
|
|
var $TypeError = require('es-errors/type');
|
|
|
|
var isPrefixOf = require('../helpers/isPrefixOf');
|
|
|
|
// var callBound = require('call-bound');
|
|
|
|
// var $charAt = callBound('String.prototype.charAt');
|
|
|
|
// https://262.ecma-international.org/9.0/#sec-isstringprefix
|
|
|
|
module.exports = function IsStringPrefix(p, q) {
|
|
if (typeof p !== 'string') {
|
|
throw new $TypeError('Assertion failed: "p" must be a String');
|
|
}
|
|
|
|
if (typeof q !== 'string') {
|
|
throw new $TypeError('Assertion failed: "q" must be a String');
|
|
}
|
|
|
|
return isPrefixOf(p, q);
|
|
/*
|
|
if (p === q || p === '') {
|
|
return true;
|
|
}
|
|
|
|
var pLength = p.length;
|
|
var qLength = q.length;
|
|
if (pLength >= qLength) {
|
|
return false;
|
|
}
|
|
|
|
// assert: pLength < qLength
|
|
|
|
for (var i = 0; i < pLength; i += 1) {
|
|
if ($charAt(p, i) !== $charAt(q, i)) {
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
*/
|
|
};
|