Function Composition - language feature

Example from JavaScript, TypeScript:

function o(f, g) {
   return function(x) {
       return f(g(x));
   }
}

Example from C#:

// Call example:
//   var c = Compose(f, g);
//
//   Func<int, bool> g = _ =>  ...
//   Func<bool, string> f = _ => ...

Func<TIn, TOut> Compose<TIn, TMid, TOut>(Func<TMid, TOut> f, Func<TIn, TMid> g) => _ => f(g(_));

Example from Haskell:

foo = f . g

Example from APL:

foo←f∘g

Example from Coconut:

(f..g..h)(x, y, z)

Example from Raku:

my &foo = &f ∘ &g;

Example from fp:

/+∘α(bu + 1):<1,2,3,4,5,6,7,8,9,10>

Languages with Function Composition include JavaScript, C#, Haskell, TypeScript, APL, Coconut, Raku, fp

Languages without Function Composition include C3

This question asks: Can you pass functions into other functions and get new combined functions?

Read more about Function Composition on the web: 1.

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