Hands-On Functional Programming with TypeScript

Hands-On Functional Programming with TypeScript: Explore functional and reactive programming to create robust and testable TypeScript applications

Functional programming is a programming paradigm that treats computation as the evaluation of mathematical functions and avoids changing-state and mutable data. The origins of the functional programming paradigm can be traced back to the 1930s when Alonzo Church introduced Lambda calculus. Lambda calculus presents a theoretical framework for describing functions and their evaluation, and is a mathematical abstraction rather than a programming language. However, Lambda calculus is the foundation of most functional programming languages.

In the late 1950s, Lisp, one of the first functional programming languages, was developed by John McCarthy. Lisp introduced many functional programming paradigm features, and it was the primary influence of other popular functional programming languages, such as Scheme and Clojure.

In 1973, Robin Milner created ML at the University of Edinburgh. ML eventually developed into several alternative languages, the most common of which are now OCaml and Standard ML. In 1977, John Backus defined functional programs in a way that allows an “algebra of programs” and follows the principle of compositionality. In 1985, Research Software Limited released Miranda, and the interest in lazy functional programming languages grew. After a couple of years, more than a dozen non-strict, purely functional programming languages existed. In 1987, at the conference on functional programming languages and computer architecture in Portland, Oregon, there was a strong consensus that a committee should be formed to define an open standard for such languages; Haskell was born.

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