Design Patterns and Best Practices in Java

Lambda expressions

The name comes from lambda calculus, where the Greek letter lambda (λ) is used to bind a term to a function. The lambda terms are either variables (x, for example), abstractions—such as λ.x.M, where M is the function—or applications, where two terms, M and N, are applied one to another. With the constructed (composed) terms, it is now possible to do expression reduction and/or conversion. Lambda-expression reduction can be tested online by using interpreters, such as the one available at Berkeley: https://people.eecs.berkeley.edu/~gongliang13/lambda/.

The following is an example of a lambda-calculus lambda expression for calculating the circle radius square when the x, y coordinates are known:

It is mathematically defined ...