function variable
nounUK /ˈfʌŋkʃən ˈveəriəbl/
US /ˈfʌŋkʃən ˈveriəbl/
A function variable is a name that holds a piece of code you can run later.
We stored the greeting in a function variable so we could call it whenever we needed it.
OTHER MEANINGS
2. In math, a variable that stands for a function rather than a number.
In the equation, f is a function variable that maps each input to an output.
3. A variable whose value is a function object in a programming language.
She assigned an anonymous function to the function variable to sort the list.
4. A placeholder in a formula that represents a whole rule or mapping.
The teacher explained that the function variable g could stand for any rule we choose.