The family of Lisps isn't functional by definition. There are Lisps which are as non-functional as one could imagine.
Anyway, where the hell are you seeing the lambda calculus in JavaScript (ignoring that "it's based on lambda calculus" is probably as useful as "computers usually work with 0s and 1s")?
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Since when is JavaScript functional?
It's not functional in the same vein as Haskell, but it is in the same vein as a lisp. Essentially, JS is an application of the lambda calculus.
The family of Lisps isn't functional by definition. There are Lisps which are as non-functional as one could imagine.
Anyway, where the hell are you seeing the lambda calculus in JavaScript (ignoring that "it's based on lambda calculus" is probably as useful as "computers usually work with 0s and 1s")?