Adding Array to Custom Google Apps Script for Google Sheets - arrays

Question

I have a bit of code to use a ZIP code to find the county and I want to be able to use the function as an array formula so that I can add it to a sheet for form responses.
I tried to look up how to make the function work with an array formula but I don't know enough to apply it.
Is it possible to make this code work as an array formula?
Sample sheet:
https://docs.google.com/spreadsheets/d/1S-TVchlE1sFTIOrbOL-v_N3LJJHLAHLJHkUtVpFeZok/edit#gid=0
/*
*
* Google Maps Formulas for Google Sheets
*
* Written by Amit Agarwal
*
* Web: https://www.labnol.org/google-maps-sheets-200817
*
*/
const md5 = (key = "") => {
const code = key.toLowerCase().replace(/\s/g, "");
return Utilities.computeDigest(Utilities.DigestAlgorithm.MD5, key)
.map((char) => (char + 256).toString(16).slice(-2))
.join("");
};
const getCache = (key) => {
return CacheService.getDocumentCache().get(md5(key));
};
const setCache = (key, value) => {
const expirationInSeconds = 6 * 60 * 60; // max is 6 hours
CacheService.getDocumentCache().put(md5(key), value, expirationInSeconds);
};
/**
* Get the county name of an address on Google Maps.
*
* =GOOGLEMAPS_COUNTY("10 Hanover Square, NY")
*
* #param {String} address The address to lookup.
* #return {String} The county of the address.
* #customFunction
*/
const GOOGLEMAPS_COUNTY = (address) => {
if (!address) {
throw new Error("No address specified!");
}
if (address.map) {
return address.map("administrative_area_level_2");
}
const key = ["administrative_area_level_2", address].join(",");
const value = getCache(key);
if (value !== null) return value;
const { results: [data = null] = [] } = Maps.newGeocoder().geocode(address);
if (data === null) {
throw new Error("Address not found!");
}
const [{ long_name } = {}] = data.address_components.filter(
({ types: [level] }) => {
return level === "administrative_area_level_2";
}
);
if (!long_name) {
throw new Error("County not found!");
}
const answer = `${long_name}`;
setCache(key, answer);
return answer;
};

Answer 1

In your situation, the following sample script is your expected goal?
Sample script:
Please add the following script to your current script and save it.
const GOOGLEMAPS_COUNTY_ARRAY = values => values.map(r => r.map(c => c.toString() ? GOOGLEMAPS_COUNTY(c) : null));
When you use this script, please put a custom function of =GOOGLEMAPS_COUNTY_ARRAY(A2:A) to a cell.
Testing:
When your sample Spreadsheet is used, the following result is obtained.
Reference:
map()