How to create custom Google Sheets functions using Google Apps Script?

To create custom Google Sheets functions using Google Apps Script, follow these steps:

1. Open a Google Sheets document.
2. Click on "Extensions" in the toolbar.
3. Select "Apps Script" from the dropdown menu.
4. A new script editor window will open on the right side of the screen.

Now, you can begin writing your custom function in the script editor using Google Apps Script. Here is an example of creating a custom function that sums two values:

5. Save your script by clicking on the floppy disk icon or pressing Ctrl + S.
6. Close the script editor window.

Your custom function is now available to use in your Google Sheets document. To use it, enter =sumValues() in a cell and provide the required arguments (e.g., =sumValues(3, 4)).

Note: Unlike built-in Google Sheets functions that begin with =, custom functions created with Google Apps Script must be entered without the = sign.