awesome-string/src/query/is_blank.js

The ultimate JavaScript string library

import coerceToString from 'helper/string/coerce_to_string';

/**
 * Checks whether `subject` is empty or contains only whitespaces.
 *
 * @function isBlank
 * @static
 * @since 1.0.0
 * @memberOf Query
 * @param {string} [subject=''] The string to verify.
 * @return {boolean} Returns `true` if `subject` is empty or contains only whitespaces or `false` otherwise.
 * @example
 * as.isBlank('');
 * // => true
 *
 * as.isBlank('  ');
 * // => true
 *
 * as.isBlank('World');
 * // => false
 */
export default function isBlank(subject) {
  const subjectString = coerceToString(subject);
  return subjectString.trim().length === 0;
}