Example code is shown below. I am just starting out and have seen examples in the declaration of the specific types instead however I don't know how to do this in the context of a struct.

contract Courses is Owned {

    struct Instructor {
        uint age;
        string fName;
        string sName;

    mapping (address => Instructor) instructors;
    address[] public instructorAccts;

    function setInstructor(address _address, uint _age, string _fName, string _sName) onlyOwner public {

        var instructor = instructors[_address];

        instructor.age = _age;
        instructor.fName = _fName;
        instructor.sName = _sName;

        instructorAccts.push(_address) -1;

2 Answers 2


Instructor storage instructor = instructors[_address];

hope it helps.


As the mapping declaration indicates, instructors maps to the Instructor type.

Instructor storage instructor = instructors[_address];
  • Thanks, yes I got confused by the syntax in the tutorial I'm following.
    – Ben Hook
    Jul 5, 2018 at 20:14

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