What is lambda? [duplicate]

This question already has answers here: Closed 1开发者_开发问答1 years ago.

Possible Duplicate:

What is the difference between a 'closure' and a 'lambda'?

Hello everyone!

I'm a JavaScript developer. I know what is closure and how it works in JavaScript.

But today I see a new noun "lambda". What is lambda? It appears to be relevant to closure in JavaScript. What's the difference between lambda and closure in JavaScript?

Thank you!

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Refer to Wikipedia:

In mathematical logic and computer science, lambda calculus, also written as λ-calculus, is a formal system for function definition, function application and recursion.

Look at Motivation, under Informal description