xsheetjs/docbits/50_csf.md

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## Workbook / Worksheet / Cell Object Description
js-xlsx conforms to the Common Spreadsheet Format (CSF):
### General Structures
Cell address objects are stored as `{c:C, r:R}` where `C` and `R` are 0-indexed
column and row numbers, respectively. For example, the cell address `B5` is
represented by the object `{c:1, r:4}`.
Cell range objects are stored as `{s:S, e:E}` where `S` is the first cell and
`E` is the last cell in the range. The ranges are inclusive. For example, the
range `A3:B7` is represented by the object `{s:{c:0, r:2}, e:{c:1, r:6}}`. Utils
use the following pattern to walk each of the cells in a range:
```js
for(var R = range.s.r; R <= range.e.r; ++R) {
for(var C = range.s.c; C <= range.e.c; ++C) {
var cell_address = {c:C, r:R};
}
}
```