Are functions objects in javascript?

// Assign a function to a variable
const x = function() {
    return `GfG!`;
};
// Call the function with the variable name
console.log(x()); // Outputs: GfG!

function fun1() {
    return `GfG`;
};
function fun2(fun) {
    console.log(fun());
}
fun2(fun1); 

function getFun(x) {
    return function(y) {
        return x * y;
    };
}
const res = getFun(2);
console.log(res(5)); 

// Define a function that adds two numbers
function add(a, b) {
    return a + b;
}
// Add a custom property to the function
add.description = "Adds two numbers.";
console.log(add(3, 4));          
console.log(add.description);