Straight to the Point

Excel Custom Functions

by Suat M. Ozgur

About The Book

Build the Excel Functions You’ve Always Wanted—That Work Everywhere

VBA user-defined functions are powerful—but they stop working the moment you open a workbook in Excel Online or on your iPad. Enter Excel Custom Functions, powered by the JavaScript API: the next generation of UDFs that run in Excel for Windows, Mac, and Online, with the ability to tap directly into web services and live data sources.

In Excel Custom Functions: Straight to the Point, developer Suat M. Ozgur shows you exactly how to create, deploy, and test these modern, portable formulas. You’ll go from your first “Hello World” function to streaming live data into Excel—all without the end user needing to know a single line of JavaScript.

You’ll learn how to:

Set up your development environment with Node.js, Git, and the Yeoman Office Generator

Use Microsoft Script Lab for quick prototyping

Understand the key files behind every add-in: JavaScript, JSON metadata, HTML loader, and manifest

Build functions that accept ranges, parameters, and return arrays

Fetch data from web APIs—like live stock prices—directly into your workbook

Write asynchronous and streaming functions for real-time results

Debug, test, and run your functions in Excel Desktop, Online, and Mac

Batch and optimize calls for speed and efficiency

Whether you’re an Excel power user ready to break past VBA’s limitations or a web developer looking to bring your skills into Excel, this book gives you the straight-to-the-point steps to build powerful, portable, and modern custom functions.

If Excel doesn’t have the function you need—make it.

Holy Macro! Books

Books on Microsoft Excel, Power Query, Power BI, ChatGPT by Excel MVPs.

Holy Macro! Books is a niche publishing company dedicated to empowering Excel users worldwide with expert-level guides on Microsoft Excel, Power Query, Power BI, and more. Founded by Excel legend Bill Jelen, the company features books authored by Microsoft MVPs, former MVPs, and top industry experts who know their way around formulas, pivot tables, and data transformations. Whether you're a beginner or a power user, Holy Macro! delivers practical, straight-to-the-point content that turns spreadsheet struggles into spreadsheet superpowers.

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