In the late 1960s, the first purely functional language was developed by Peter Landin and called ISWIM. Lisp is not a pure functional language as it still retains variable assignments, but it is very well-known and powerful, and is traditionally regarded as a good language for developing Artificial Intelligence applications. The lineage of Haskell can be traced back to the 1920s, when Haskell Curry and Alonzo Church were developing the lambda calculus, which formed a partial basis of Lisp in the 1960s.
It was standardised in early 1999 with the introduction of Haskell 98, mostly solving the problem which had previously arisen of multiple and incompatible implementations of Haskell. Haskell is a functional programming language named after Haskell Curry, the developer of the lambda calculus upon which the language is based.
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