CSCE 314 Programming Languages - TAMU Computer Science ...

Lambda ExpressionsFunctions can be constructed without naming thefunctions by using lambda expressions.λx → x+xThis nameless function takes a numberx and returns the result x+x. The symbol λ is the Greek letter lambda, and is typedat the keyboard as a backslash \. In mathematics, nameless functions are usuallydenoted using the symbol, as in x x+x. In Haskell, the use of the λ symbol for namelessfunctions comes from the lambda calculus, the theoryof functions on which Haskell is based.12