21 lines
493 B
JavaScript
21 lines
493 B
JavaScript
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'use strict';
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/**
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* Returns the subdomain of a hostname string
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*
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* @api
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* @param {string} hostname
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* @param {string} domain - the root domain of the hostname
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* @return {string|null} a subdomain string if any, blank string if subdomain
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* is empty, otherwise null.
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*/
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module.exports = function getSubdomain(hostname, domain) {
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// No domain found? Just abort, abort!
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if (domain === null) {
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return null;
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}
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return hostname.substr(0, hostname.length - domain.length - 1);
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};
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