Haskell
Cardano is written in Haskell, a functional language that emphasizes 'pure' functions. That is, functions that produce the same result for the same input.
Haskell is particularly well suited to Cardano's high-assurance code, and the need for greater formal verification in the blockchain. Cardano aims to become a global social and financial system, which requires a very high degree of reliability and verification.
Many other companies use Haskell, both because of its security properties and pure functional nature. Well-known firms like Oracle and Facebook use Haskell for blockchain research and advertising, respectively, while lesser known companies such as Atos IT and Jotron use it for building applications for the aerospace industry.
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