Question

Without changing this function:

function operate(operator, operand1, operand2) {
    return operator(operand1, operand2);
}

I want to write out:

var x = operator(add, operate(add, 2, 3), operate(multiply, 4, 5));

And get 25 as a value of x. How can I do this?

Answer 1

The reason being that operator is expected to be a function, but execution requires add and multiply to be defined as:

function add(x,y) {
    return x + y;
}

function multiply(x,y) {
    return x * y;
}

Also, I think there’s a typo:

ReferenceError: operator is not defined

I would have:

var x = operate(add, operate(add, 2, 3), operate(multiply, 4, 5));

This gives x = 25.