Higher Order functions
Functions can be used as an arguments to other functions as we have seen in function composition. This is possible because a function always evaluates to a value. This is the basis of function composition.
Higher Order functions can also return a function definition, as when that function definition is evaluated it to will return a value.
Return the even numbers from 1 to 10
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<!--endsec--> > #### Note::Create a named function as a higher order function called `twice` > The function twice which takes a function and value as arguments. > > The twice function should call the function passed as an argument on the value passed as an argument. > > The result should be then used as an argument to calling the function passed as an argument again. > > Call the twice function with an inline function which takes a number as an argument and adds it to Pi, `3.14`. ```eval-clojure (defn twice [f] ,,,)