what is lambda
Lambda (uppercase Î», lowercase Î»; Greek: Î»Î¬Î¼(Î²)Î´Î± lam(b)da) is the 11th letter of the Greek alphabet. In the system of Greek numerals lambda has a value of 30.Lambda is related to the Phoenician letter Lamed.Letters in other alphabets that stemmed from lambda include the Latin L and the Cyrillic letter El (Ð», Ð»). Lambda is occasionally used in graphic design to represent a stylised 'A'. 2  Examples include the Disney movie Atlantis: The Lost Empire, the logo of the band Angels & Airwaves, the logo of the band Dream Theater, the logo of electronics company Samsung, and the logo of the engineering consultancy Atkins.
A lambda is a type of function, defined inline. Along with a lambda you also usually have some kind of variable type that can hold a reference to a function, lambda or otherwise.For instance, here's a C# piece of code that doesn't use a lambda:s you can see from the snippet of Python, the function adder takes in an argument x, and returns an anonymous function, or lambda, that takes another argument y. That anonymous function allows you to create functions from functions. This is a simple example, but it should convey the power lambdas and closures have.