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* @license Apache-2.0
*
* Copyright (c) 2026 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
// MODULES //
var isString = require( '@stdlib/assert/is-string' );
// MAIN //
/**
* Tests if a value is a palindrome.
*
* @param {*} v - value to test
* @returns {boolean} boolean indicating if a value is a palindrome
*
* @example
* var bool = isPalindrome( 'racecar' );
* // returns true
*
* @example
* var bool = isPalindrome( 'abc' );
* // returns false
*/
function isPalindrome( v ) {
var len;
var i;
var j;
if ( !isString( v ) ) {
return false;
}
len = v.length;
if ( len <= 1 ) {
return true;
}
i = 0;
j = len - 1;
while ( i < j ) {
if ( v.charAt( i ) !== v.charAt( j ) ) {
return false;
}
i += 1;
j -= 1;
}
return true;
}
// EXPORTS //
module.exports = isPalindrome;
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