let arr = [];
function add(obj){
    let index = arr.map(function(e){return e.name}).indexOf(obj.name)
    if(index >= 0){
       arr[index].array.push(obj.array)
    } else {
        obj.array = [obj.array]
        arr.push(obj)
    }
}

function remove(obj){
    let index = arr.map(function(e){return e.name}).indexOf(obj.name);
    if(index >= 0){
        arr.splice(index, 1);
    }
}
add({name: 'A', array: 'some string'});
add({name: 'B', array: 'first'});
add({name: 'B', array: 'fifth'});
add({name: 'B', array: 'second'});
add({name: 'B', array: 'zero'});
add({name: 'C', array: 'some'});
arr.sort((a, b) => a.name.localeCompare(b.name))
arr.forEach(e=> {console.log(e)})
console.log('--------------------------------------------');
remove({name: 'B'});
arr.forEach(e=> {console.log(e)})