When You Should Use the New Excel LET Function

August 13, 2020 Excel for Office 365 & Dynamic Arrays

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Excel's new LET function can make your formulas easier to read and it can improve the performance of your formulas so they run faster. This applies to formulas that use the same expression (e.g. formulas, values) multiple times.

In this video you'll learn the basics of the LET function and also find out in which situation the LET function can REALLY make a difference for you. I measured the time for a full calculation on a large data set for different scenarios. You'll be surprised when you see the results!

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Note: LET function is not available in Excel 2019 or Excel 2016. Only in Excel for Microsoft 365.

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Time Stamps
00:00 Why use Excel's LET function
01:07 Availability and Syntax of Excel LET Function
03:12 Example of LET Function with IF Conditions
06:53 Example of LET Function with Multiple IF Conditions and Symbols
08:55 Does Excel LET Function REALLY Improve Performance?
11:03 LET Function with Excel Dynamic Arrays
14:46 Performance of Excel LET Function with Dynamic Arrays

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