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chore(curriculum): changed external links to news articles in 4 challenges (#43373)

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* changed 4 links

* fix wording

* change link as suggested by @gikf
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2021-09-27 10:12:53 +02:00
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curriculum/challenges/english/10-coding-interview-prep/rosetta-code/y-combinator.md
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@ -8,7 +8,7 @@ dashedName: y-combinator
# --description--
In strict [functional programming](<https://en.wikipedia.org/wiki/Functional programming> "wp: functional programming") and the [lambda calculus](<https://en.wikipedia.org/wiki/lambda calculus> "wp: lambda calculus"), functions (lambda expressions) don't have state and are only allowed to refer to arguments of enclosing functions. This rules out the usual definition of a recursive function wherein a function is associated with the state of a variable and this variable's state is used in the body of the function. The [Y combinator](https://mvanier.livejournal.com/2897.html) is itself a stateless function that, when applied to another stateless function, returns a recursive version of the function. The Y combinator is the simplest of the class of such functions, called [fixed-point combinators](<https://en.wikipedia.org/wiki/Fixed-point combinator> "wp: fixed-point combinator").
In strict [functional programming](<https://www.freecodecamp.org/news/the-principles-of-functional-programming/> "news: the principles of functional programming") and the [lambda calculus](<https://en.wikipedia.org/wiki/lambda calculus> "wp: lambda calculus"), functions (lambda expressions) don't have state and are only allowed to refer to arguments of enclosing functions. This rules out the usual definition of a recursive function wherein a function is associated with the state of a variable and this variable's state is used in the body of the function. The [Y combinator](https://mvanier.livejournal.com/2897.html) is itself a stateless function that, when applied to another stateless function, returns a recursive version of the function. The Y combinator is the simplest of the class of such functions, called [fixed-point combinators](<https://en.wikipedia.org/wiki/Fixed-point combinator> "wp: fixed-point combinator").
# --instructions--