voca/es/is_upper_case.js

The ultimate JavaScript string library

import './internal/is_nil.js';
import './is_string.js';
import { c as coerceToString } from './internal/coerce_to_string.js';
import './internal/const.js';
import './internal/const_extended.js';
import isAlpha from './is_alpha.js';

/**
 * Checks whether `subject` contains only upper case characters.
 *
 * @function isUpperCase
 * @static
 * @since 1.0.0
 * @memberOf Query
 * @param {string} [subject=''] The string to verify.
 * @return {boolean} Returns `true` if `subject` is upper case or `false` otherwise.
 * @example
 * v.isUpperCase('ACDC');
 * // => true
 *
 * v.isUpperCase('Morning');
 * // => false
 */

function isUpperCase(subject) {
  var subjectString = coerceToString(subject);
  return isAlpha(subjectString) && subjectString.toUpperCase() === subjectString;
}

export default isUpperCase;