Get all creatable fields for any SObject (Apex, Salesforce)

gistfile1.cls

public static set<string> getCreatableFields(Schema.SObjectType objectType)
{
    Map<String, Schema.SObjectField> fMap = objectType.getDescribe().Fields.getMap();
    set<string> creatableFields = new set<string>();
     
    if (fMap != null){
        for (Schema.SObjectField ft : fMap.values()){ // loop through all field tokens (ft)
            Schema.DescribeFieldResult fd = ft.getDescribe(); // describe each field (fd)
            if (fd.isUpdateable()&&!fd.isUnique()){ // field is creatable
                creatableFields.add(fd.getName());
            }
        }
    }
    return creatableFields;
}