65 lines
1.5 KiB
JavaScript
65 lines
1.5 KiB
JavaScript
/**
|
|
* @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 lowercase = require( '@stdlib/string/lowercase' );
|
|
var uppercase = require( '@stdlib/string/uppercase' );
|
|
var isString = require( './../../is-string' ).isPrimitive;
|
|
|
|
|
|
// MAIN //
|
|
|
|
/**
|
|
* Tests if a value is a string having an uppercase first character.
|
|
*
|
|
* @param {*} value - value to test
|
|
* @returns {boolean} boolean indicating whether a value is a string with an uppercase first character
|
|
*
|
|
* @example
|
|
* var bool = isCapitalized( 'Hello' );
|
|
* // returns true
|
|
*
|
|
* @example
|
|
* var bool = isCapitalized( 'WORLD' );
|
|
* // returns true
|
|
*
|
|
* @example
|
|
* var bool = isCapitalized( '!' );
|
|
* // returns false
|
|
*
|
|
* @example
|
|
* var bool = isCapitalized( 'salt and light' );
|
|
* // returns false
|
|
*/
|
|
function isCapitalized( value ) {
|
|
var ch;
|
|
if ( isString( value ) && value !== '' ) {
|
|
ch = value[ 0 ];
|
|
return ( ch === uppercase( ch ) && ch !== lowercase( ch ) );
|
|
}
|
|
return false;
|
|
}
|
|
|
|
|
|
// EXPORTS //
|
|
|
|
module.exports = isCapitalized;
|