Function mapDomain

lib/punycode.js:84–98

* A simple `Array#map`-like wrapper to work with domain name strings or email * addresses. * @private * @param {String} domain The domain name or email address. * @param {Function} callback The function that gets called for every * character. * @returns {String} A new string of characters retu

(domain, callback)

 * function.
 */
function mapDomain(domain, callback) {
	const parts = domain.split('@');
	let result = '';
	if (parts.length > 1) {
		// In email addresses, only the domain name should be punycoded. Leave
		// the local part (i.e. everything up to `@`) intact.
		result = parts[0] + '@';
		domain = parts[1];
	}
	// Avoid `split(regex)` for IE8 compatibility. See #17.
	domain = domain.replace(regexSeparators, '\x2E');
	const labels = domain.split('.');
	const encoded = map(labels, callback).join('.');
	return result + encoded;
}

/**
 * Creates an array containing the numeric code points of each Unicode