Скачать или смотреть Mastering the substring Method in Google Apps Script Custom Functions

Learn how to properly implement a `substring` method in your Google Apps Script custom functions to avoid common errors and improve functionality.
---
This video is based on the question https://stackoverflow.com/q/66913194/ asked by the user 'Geo' ( https://stackoverflow.com/u/15389540/ ) and on the answer https://stackoverflow.com/a/66914286/ provided by the user 'Wicket' ( https://stackoverflow.com/u/1595451/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Custom function substring Apps Script

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Mastering the substring Method in Google Apps Script Custom Functions

If you've ever tried to create a custom function in Google Sheets using Google Apps Script, you might have encountered a few hiccups along the way. One common issue that many users face is integrating the substring method or similar string manipulations. A user recently shared their struggle while trying to utilize the slice method, and this post will break down the solution step by step.

The Problem

A user was attempting to create a simple function to extract a substring from a number represented as a string. Here's the code snippet they provided:

[[See Video to Reveal this Text or Code Snippet]]

Despite its simplicity, the function was not executing as expected and led to an error. Why did this happen? Let's dive into the details.

Understanding the Cause of the Error

The confusion primarily stems from two factors that are essential when working with Google Apps Script, which is a variant of JavaScript:

Case Sensitivity: JavaScript is case-sensitive. This means that variables must be declared with the exact same casing when referred to later in the code.

Variable Declaration: The keyword used for declaring variables should be in lowercase (var) and not uppercase (Var), as JavaScript treats them as separate identifiers.

Key Points to Note:

Replace Var with var to correctly declare your variables.

Ensure that variable names are consistent, such as using num instead of Num, as these are treated differently by the script.

The Solution: Step-by-Step Guide

To get your function working correctly, follow these steps:

Step 1: Use Correct Variable Declaration

Change the variable declaration from Var to var. Your corrected code should look like this:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Maintain Consistent Variable Naming

Make sure to stay consistent with your variable names. Change Num to num in the slice method:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Complete Example

Here’s how the complete function could look:

[[See Video to Reveal this Text or Code Snippet]]

Step 4: Using the Function in Google Sheets

Now that your function is correctly set up, you can use it in your Google Sheets to extract substrings as needed. You simply need to call this function from a cell and it will return the result.

Conclusion

By following these steps to fix the variable name casing and declaration, you can effectively use the substring or slice method in your Google Apps Script custom functions. Remember to always check for case-sensitivity and maintain consistency in your variable names to ensure your scripts run smoothly.

Now you’re ready to take your Google Sheets capabilities to the next level with custom functions that utilize string manipulation methods! Happy scripting!