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-# calque
-Improved calculator
+<img src="logo.png" width="169px">
 
-## TODO
-- make saveable/loadable
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+Reactive calculator
+
+## Expressions
+
+```
+2 inch to cm
+cos(45 deg)
+2 + 2 * 2
+sqrt(3^2 + 4^2)
+```
+
+## Variables
+
+```
+a = 25
+b = a * 2
+postal code = 1122
+```
+
+## Summing lists
+
+```
+animals:
+  cats = 2
+  dogs = 3
+plants:
+  trees = 20
+  vegetables:
+    potatoes = 10
+    carrots = 10
+```
+
+## Functions
+
+```
+pow2(x) = x ^ 2
+pow2(6)
+```
+
+## Last result
+
+```
+2 * 2
+last + 1
+```
+
+## Keys
+
+Duplicate line or selection: Ctrl+D
+
+Change selected number: Up/Down
+
+Change selected number 10x: Shift+Up/Down
+
+Change indent: Tab/Shift+Tab
+
+## Using Math.js:
+
+https://github.com/grimalschi/mathjs
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