voca/es/is_lower_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` has only lower case characters.
 *
 * @function isLowerCase
 * @static
 * @since 1.0.0
 * @memberOf Query
 * @param {string} [subject=''] The string to verify.
 * @return {boolean} Returns `true` if `subject` is lower case or `false` otherwise.
 * @example
 * v.isLowerCase('motorcycle');
 * // => true
 *
 * v.isLowerCase('John');
 * // => false
 *
 * v.isLowerCase('T1000');
 * // => false
 */

function isLowerCase(subject) {
  var valueString = coerceToString(subject);
  return isAlpha(valueString) && valueString.toLowerCase() === valueString;
}

export default isLowerCase;