Custom Functions in Google Sheets | Apps Script - Google …
https://developers.google.com/apps-script/guides/sheets/functions
WebMar 5, 2024 · Google Sheets offers hundreds of built-in functions like AVERAGE, SUM, and VLOOKUP. When these aren’t enough for your needs, you can use Google Apps Script to write custom functions — say, to convert meters to miles or fetch live content from the Internet — then use them in Google Sheets just like a built-in function.
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