pubsub alternative in golang

I have simple task that already done in javascript using pubsub, here is the task:

I have object let say A and another 2 object that have interest in some element(string in this case), let say Foo interest in element m, n and Bar interest in element n, o, p. The interest can intersect.

The A object have method adding/remove element and when that object contain m, n element which Foo interest in, then that object stored in Foo here's the pseudo code in javascript using pubsub

var A = {};

var Foo = {
    interests: ['m', 'n'],
    storedObj: {},
    tempObj: {}
};

// Bar same as Foo with different interest ['n', 'o', 'p']

// somewhere in Foo and Bar constructor
// Foo and Bar subscribe too each interests element
// for each interests when add
subscribe('add'+interest, function(obj) {
    // store this obj in tempObj and increment until satisfy all 
    // interest
    tempObj[obj]++;

    // if this obj satisfy all interest then store it in array of obj
    if(tempObj[obj] === len(interests)) {
        storedObj[obj] = true;
    }
});

// for each interests when remove
subscribe('remove'+interest, function(obj) {
    // remove from storedObj
    delete storedObj[obj];

    // decrement tempObj so it can be used for later if the interest 
    // is adding again
    tempObj[obj]--;
});

// inside A prototype
prototype.add = function(interest) {
    publish('add'+interest, this);
    return this;
}
prototype.remove = function(interest) {
    publish('remove'+interest, this);
    return this;
}

// implementation
A.add('m')
 .add('n')
 .add('o')

// then A is stored inside Foo but not in Bar because A doesn't have 
// `p`, but it still stored Bar.tempObj and have value 2 and waiting 
// for `p` to be add

A.remove('m')
 .add('p')

// then A is removed from Foo and stored in Bar

I want to porting this task into golang but i don't want using pubsub, i want more idiomatic to golang way. NOTE: i already done using pubsub in golang as well.

Can you show me how to do it in golang? i'm thingking using channel, but and can't find the solution.