Implementing Unsure Calculator in 100 lines of Haskell
Implementing a calculator with normal ranges, embedded in Haskell, using a simplified probability monad.
Implementing Unsure Calculator in 100 lines of Haskell launched on April 25, 2025 with 5 votes and more than 75% of that year's launches. The site was still online in September 2026, 1 year on.
What it does
Implementing a calculator with normal ranges, embedded in Haskell, using a simplified probability monad. The recently trendy Unsure Calculator makes reasoning about numbers with some uncertainty just as easy as calculating with specific numbers. The key idea is to add a new “range” operator (written ~ ) to the vocabulary of a standard calculator. The range x~y denotes that a real value is uncertain, but we are 95% sure that it falls between x and y 1 . Reading the notation is easy: when you see 10~15, you say: “ten to fifteen”. Arithmetic operations and friends (e.g. sin , or log ) transparently operate on ranges and literal numbers alike. Calculation results in a plot with a range of…from alt-romes.github.io
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