awesome-string
Version:
The ultimate JavaScript string library
23 lines (22 loc) • 666 B
JavaScript
import coerceToString from 'helper/string/coerce_to_string';
import isAlpha from 'query/is_alpha';
/**
* 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
* as.isUpperCase('ACDC');
* // => true
*
* as.isUpperCase('Morning');
* // => false
*/
export default function isUpperCase(subject) {
const subjectString = coerceToString(subject);
return isAlpha(subjectString) && subjectString.toUpperCase() === subjectString;
}