Courses Contract | First | Coursetro

pragma solidity ^0.4.18;

contract Courses {

    struct Instructor {
        uint age;
        string fname;
        string lname;
    }

    mapping (address => Instructor) instructors;

    address[] public instructorAccounts;

    function setInstructor(address _address, uint _age, string _fname, string _lname) public {
        Instructor storage instructor = instructors[_address];

        instructor.age = _age;
        instructor.fname = _fname;
        instructor.lname = _lname;

        instructorAccounts.push(_address) -1;
    }

    function getInstructors() view public returns(address[]) {
        return instructorAccounts;
    }

    function getInstructor(address _address) view public returns(uint, string, string) {
        return (instructors[_address].age, instructors[_address].fname, instructors[_address].lname);
    }

    function countInstructors() view public returns(uint) {
        return instructorAccounts.length;
    }
}