node/tools/eslint/node_modules/is-hexadecimal/index.js

'use strict';

module.exports = hexadecimal;

/* Check if the given character code, or the character
 * code at the first character, is hexadecimal. */
function hexadecimal(character) {
  var code = typeof character === 'string' ?
    character.charCodeAt(0) : character;

  return (code >= 97 /* a */ && code <= 102 /* z */) ||
    (code >= 65 /* A */ && code <= 70 /* Z */) ||
    (code >= 48 /* A */ && code <= 57 /* Z */);
}