/** * @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 an uppercase string. * * @param {*} value - value to test * @returns {boolean} boolean indicating whether value is an uppercase string * * @example * var bool = isUppercase( 'HELLO' ); * // returns true * * @example * var bool = isUppercase( 'World' ); * // returns false * * @example * var bool = isUppercase( '!' ); * // returns false * * @example * var bool = isUppercase( 'salt and light' ); * // returns false */ function isUppercase( value ) { return ( isString( value ) && value === uppercase( value ) && value !== lowercase( value ) ); } // EXPORTS // module.exports = isUppercase;