//Assign a function to a variable originalFunc

const originalFunc = (num) => { return num + 2 };

​

//Re-assign the function to a new variable newFunc

const newFunc = originalFunc;

​

//Access the function's name property

newFunc.name; //'originalFunc'

​

//Return the function's body as a string

newFunc.toString(); //'(num) => { return num + 2 }'

​

//Add our own isMathFunction property to the function

newFunc.isMathFunction = true;

​

//Pass the function as an argument

const functionNameLength = (func) => { return func.name.length }; 

functionNameLength(originalFunc); //12

​

//Return the function

const returnFunc = () => { return newFunc };

returnFunc(); //[Function: originalFunc]