6. spreadsheet are code
DESCRIPTION
Week 1 - Lecture hour 2TRANSCRIPT
![Page 1: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/1.jpg)
Spreadsheets for developers
Felienne Hermans
![Page 2: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/2.jpg)
![Page 3: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/3.jpg)
![Page 4: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/4.jpg)
Spreadsheets are code
![Page 5: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/5.jpg)
1) Used for similar problems
![Page 6: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/6.jpg)
![Page 7: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/7.jpg)
But why in a spreadsheet?
![Page 8: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/8.jpg)
![Page 9: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/9.jpg)
2) Formulas are Turing complete
![Page 10: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/10.jpg)
![Page 11: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/11.jpg)
![Page 12: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/12.jpg)
![Page 13: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/13.jpg)
![Page 14: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/14.jpg)
![Page 15: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/15.jpg)
In summary: both the activities,
complexity and problems are the same
![Page 16: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/16.jpg)
Spreadsheets are code
In summary: both the activities,
complexity and problems are the same
![Page 17: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/17.jpg)
And not just a programming
language!
![Page 18: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/18.jpg)
Stukje Bret Victor hier
![Page 19: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/19.jpg)
![Page 20: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/20.jpg)
![Page 21: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/21.jpg)
Selection
Sort
![Page 22: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/22.jpg)
![Page 23: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/23.jpg)
![Page 24: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/24.jpg)
![Page 25: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/25.jpg)
![Page 26: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/26.jpg)
![Page 27: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/27.jpg)
![Page 28: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/28.jpg)
![Page 29: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/29.jpg)
![Page 30: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/30.jpg)
![Page 31: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/31.jpg)
![Page 32: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/32.jpg)
![Page 33: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/33.jpg)
![Page 34: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/34.jpg)
![Page 35: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/35.jpg)
![Page 36: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/36.jpg)
![Page 37: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/37.jpg)
![Page 38: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/38.jpg)
![Page 39: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/39.jpg)
![Page 40: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/40.jpg)
![Page 41: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/41.jpg)
![Page 42: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/42.jpg)
![Page 43: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/43.jpg)
![Page 44: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/44.jpg)
![Page 45: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/45.jpg)
![Page 46: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/46.jpg)
![Page 47: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/47.jpg)
![Page 48: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/48.jpg)
![Page 49: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/49.jpg)
![Page 50: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/50.jpg)
Level 2: nicer and a bit
scarier
![Page 51: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/51.jpg)
![Page 52: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/52.jpg)
![Page 53: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/53.jpg)
![Page 54: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/54.jpg)
![Page 55: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/55.jpg)
![Page 56: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/56.jpg)
![Page 57: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/57.jpg)
![Page 58: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/58.jpg)
![Page 59: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/59.jpg)
![Page 60: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/60.jpg)
![Page 61: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/61.jpg)
![Page 62: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/62.jpg)
![Page 63: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/63.jpg)
![Page 64: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/64.jpg)
![Page 65: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/65.jpg)
![Page 66: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/66.jpg)
![Page 67: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/67.jpg)
![Page 68: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/68.jpg)
![Page 69: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/69.jpg)
![Page 70: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/70.jpg)
![Page 71: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/71.jpg)
![Page 72: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/72.jpg)
![Page 73: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/73.jpg)
![Page 74: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/74.jpg)
![Page 75: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/75.jpg)
![Page 76: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/76.jpg)
![Page 77: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/77.jpg)
![Page 78: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/78.jpg)
![Page 79: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/79.jpg)
![Page 80: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/80.jpg)
![Page 81: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/81.jpg)
![Page 82: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/82.jpg)
![Page 83: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/83.jpg)
![Page 84: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/84.jpg)
![Page 85: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/85.jpg)
![Page 86: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/86.jpg)
![Page 87: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/87.jpg)
![Page 88: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/88.jpg)
![Page 89: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/89.jpg)
![Page 90: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/90.jpg)
![Page 91: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/91.jpg)
![Page 92: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/92.jpg)
![Page 93: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/93.jpg)
![Page 94: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/94.jpg)
![Page 95: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/95.jpg)
![Page 96: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/96.jpg)
![Page 97: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/97.jpg)
![Page 98: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/98.jpg)
![Page 99: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/99.jpg)
![Page 100: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/100.jpg)
![Page 101: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/101.jpg)
![Page 102: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/102.jpg)
![Page 103: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/103.jpg)
![Page 104: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/104.jpg)
With i = swap it is almost the same
![Page 105: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/105.jpg)
So if spreadsheets are code, can we
apply software engineering methods?
![Page 106: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/106.jpg)
![Page 107: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/107.jpg)
![Page 108: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/108.jpg)
So, we built BumbleBee:
a refactoring tool for spreadsheets
![Page 109: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/109.jpg)
So, we built BumbleBee:
a refactoring tool for spreadsheets
![Page 110: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/110.jpg)
![Page 111: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/111.jpg)
![Page 112: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/112.jpg)
![Page 113: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/113.jpg)
![Page 114: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/114.jpg)
![Page 115: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/115.jpg)
![Page 116: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/116.jpg)
The transformations are entirely
programmable, with a small language
![Page 117: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/117.jpg)
And of course, if you say refactoring,
you say …
![Page 118: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/118.jpg)
And of course, if you say refactoring,
you say testing
![Page 119: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/119.jpg)
Spreadsheets tests are hiding in plain
sight
![Page 120: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/120.jpg)
![Page 121: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/121.jpg)
These test formulas can be exploited
![Page 122: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/122.jpg)
Our tool Expector can find test formulas
![Page 123: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/123.jpg)
![Page 124: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/124.jpg)
![Page 125: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/125.jpg)
![Page 126: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/126.jpg)
![Page 127: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/127.jpg)
![Page 128: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/128.jpg)
Expector helps users to understand
robustness of their spreadsheets
![Page 129: 6. spreadsheet are code](https://reader034.vdocuments.us/reader034/viewer/2022051817/547cf7f8b47959c5508b47e7/html5/thumbnails/129.jpg)