( Higher - Order ) Functions (1) μΈλ€μΌν 리μ€νΈν (Higher-Order) Functions, Sequences, Recursion and TreeRecursion, Trees ( Higher - Order ) Functions Functions : a function is made up of a series of statements, and takes in an input and maps it to an output How we descrive functions : - domain : the set of possible inputs a function may take in - range : the set of possible output values a function may return - behavior : the relationship between input and output EXAM _ pay close attention to the specified domain .. μ΄μ 1 λ€μ