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* @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( '@stdlib/assert/is-string' ).isPrimitive;
// VARIABLES //
// Character codes:
var ZERO = 48;
var NINE = 57;
// MAIN //
/**
* Tests whether a string contains only numeric digits.
*
* @param {*} x - value to test
* @returns {boolean} boolean indicating if a string contains only numeric digits
*
* @example
* var out = isDigitString( '0123456789' );
* // returns true
*
* @example
* var out = isDigitString( '0xffffff' );
* // returns false
*
* @example
* var out = isDigitString( '' );
* // returns false
*
* @example
* var out = isDigitString( 123 );
* // returns false
*/
function isDigitString( x ) {
var len;
var ch;
var i;
if ( !isString( x ) ) {
return false;
}
len = x.length;
if ( len === 0 ) {
return false;
}
for ( i = 0; i < len; i++ ) {
ch = x.charCodeAt( i );
if ( ch < ZERO || ch > NINE ) {
return false;
}
}
return true;
}
// EXPORTS //
module.exports = isDigitString;
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