Please Help JavaScript Function Expressions

My code is not working. I checked the solution, and my code seems pretty similar. I am not sure If I have made a mistake, or if there is a bug that is preventing my code from working?

function isGreaterThan(numberOne, numberTwo) => {
if(numberOne > numberTwo){
return true;
} else {
return false;

isGreaterThan(4, 8)

Refactor the function declaration to be a function expression using arrow function syntax.

Be sure to call the function at the end.

Quickly review the difference in syntax of declaration versus expression. Remember that expressions are assigned to a variable.