/**

* @license Apache-2.0

*

* Copyright (c) 2018 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( './../../is-string' ).isPrimitive;

// VARIABLES //

// Character codes:

var ZERO = 48;

var NINE = 57;

var A = 65;

var F = 70;

var a = 97;

var f = 102;

// MAIN //

/**

* Tests whether a string contains only hexadecimal digits.

*

* @param {*} x - value to test

* @returns {boolean} boolean indicating if a string contains only hexadecimal digits

*

* @example

* var out = isHexString( '0123456789abcdefABCDEF' );

* // returns true

*

* @example

* var out = isHexString( '0xffffff' );

* // returns false

*

* @example

* var out = isHexString( '' );

* // returns false

*

* @example

* var out = isHexString( 123 );

* // returns false

*/

function isHexString( x ) {

}

// EXPORTS //

module.exports = isHexString;