add Office sw - spreadsheet concatenate w & operator

README.md

@@ -20,6 +20,7 @@ This repo is inspired by the [@jbrandchaud/til](https://github.com/jbranchaud/ti
 - [Jira](#jira)
 - [Markdown](#markdown)
 - [Material UI](#material-ui)
+- [Office Software](#office-software)
 - [Scrum](#scrum)
 - [SVG](#svg)
 - [VS Code](#vs-code)
@@ -91,6 +92,10 @@ This repo is inspired by the [@jbrandchaud/til](https://github.com/jbranchaud/ti
 
 - [`sx` prop interprets `number` values inconsistently](material-ui/sx-prop-interprets-number-values-inconsistently.md)
 
+### Office Software
+
+- [`[Spreadsheet]` - Concatenate with `&` operator](office-software/spreadsheet-concatenate-with-ampersand.md)
+
 ### Scrum
 
 - [Scrum Poker Online (free and quick)](scrum/scrum-poker-online-free-quick.md)

office-software/spreadsheet-concatenate-with-ampersand.md

@@ -0,0 +1,23 @@
+# `[Spreadsheet]` - Concatenate with `&` operator
+
+In Spreadsheet software like Google Sheets or Microsoft Office, the `&` operator does 2 beautiful things:
+
+- Converts the output of the 2 elements on either side of it as `strings`
+- Joins the `string` outputs
+
+```sh
+= 0 & 5 # 05
+= 'con' & 'cat' # concat
+```
+
+It's especially useful for summary cells when you want to show 2 values in the same cell or format a value in an uncommon way that may not be built in to the spreadsheet software (or you don't feel like finding it). For example:
+
+```sh
+= SUM(A1:A10) & 'mL' # 500mL
+= 'Total: ' & SUM(A1:A10) & ` | Avg: ` & AVERAGE(A1:A10) # Total: 500 | Avg: 250
+```
+
+## Resources
+
+- [Excel Operators](<https://excelx.com/formula/operators/#:~:text=%2C%3DA2%2DA1-,Concatenation%20Operator,result%20will%20be%20a%20string.&text=We%20can%20use%20%26(Ampersand)%20Operator%20to%20concatenate%20two%20strings.>)
+- [Google Sheets Knowledge Base](https://support.google.com/docs/thread/8978489/displaying-two-separate-formulas-in-one-cell-in-sheets?hl=en)