hacer una calculadora

Script
function calculator(operator, a, b){
    
    if(operator == '+'){
        return a + b;
    }

    if(operator == '-'){
        return a - b;
    }

    if(operator == '*'){
        return a * b;
    }

    if(operator == '/'){
        return a / b;
    }
}


calculator('+',2,3)