Well,

I just got out of bed, so I can't tell you why exactly I used Object.assign beside that I remember observing on objects returned byt the game, that their type were not nececarily basic type[*], thus leaving some method calls with 'undefined is not a function'... that is when its returned value is assigned to a variable, otherwise, no error raised, and hell that is an unwelcomed change from Python or C#. Anyway, now I remember why I used it : I just didn't remebember if the returned object of creep.room.find were a real Array, I still have to remember how to test the type of an array, instead of 'typeof []', whom return value is not helpful [Object object] or something...

By the way, here is the code right now - will be slightly modified to handle cases where there is no containers - with the preceding section, you will notice that I also used Object.assign with no problems whatsoever in the first part:

let buildings = Object.assign([],creep.room.find(FIND_MY_STRUCTURES, {
    filter: function(structure){
        return (structure.structureType == STRUCTURE_EXTENSION || structure.structureType == STRUCTURE_SPAWN);
    }}));
assert(buildings.length > 0, 'spawns and extensions not detected in hauler AI');
let lenBuildings = buildings.length;
let tmp = creep.room.find(
            FIND_STRUCTURES,
            {filter: (s) => s.structureType == STRUCTURE_CONTAINER}
);
assert(tmp[0].structureType == STRUCTURE_CONTAINER);
buildings = buildings.concat(tmp);
// buildings are filled first with spawns and extensions and only then containers are added to it.
// so iterating over buildings, the first buildings will be spawns and extensions.
assert(buildings.length > lenBuildings, 'container not detected in hauler AI');
assert(buildings[lenBuildings].structureType == STRUCTURE_CONTAINER);

[*]:but maybe these observations were just the fruits of tireness...

Nah, forget it : apparently concat() and Object.assign() don't mix very well... I really don't know why, but it did. That is... a bit depressing though when things that should work don't ...

anyway... hope it can be of use to someone.

Hi all,

I have the same problem as the author of this post :

http://screeps.com/forum/topic/945/CONTAINER-not-found 

However, I have already written it correctly (well, obvioulsy not in fact), yet it does not work :

buildings.concat(
    Object.assign(
        [],
        creep.room.find(
            FIND_STRUCTURES,
            {filter : (s) => {return s.structureType == STRUCTURE_CONTAINER}}
        )
    )
);
// buildings are filled first with spawns and extensions and only then containers are added to it.
// so iterating over buildings, the first buildings will be spawns and extensions.
assert(buildings.length == 7, 'container not detected in hauler AI');

what is wrong with it ?

Could someone explain to me the subtleties of thes evasive unowned structures ?

Ahhhhhhh.... okay, now that makes sense... yup, confusing it was indeed.

Really ? Just like that ?

I feel so dumb...

I just assumed that because objects stored in Memory were serialized / "stringified" / whatever, objects like arrays and "dictionaries" ( {a:1,...} ) , any property request on Memory would return a duplicate of the value...

And your statement made me understand that the console  only evaluate expressions (this, kinda sucks)

Well, that reminds me a lesson : don't overthink things, try & see...

Thanks pal

Hi everyone,

I discorvered Screeps few days ago (and JS with it...), I already know programming metaclasses with python.

I would like to make an object which is basically a simple alias, the goal is to work with Memory.

let says that we set this :

Memory.myGlobals = {};

Let's imagine that I create the object that act as an alias (as in C), and name its instance '_glob'

in the end, typing this :

_glob.stuff = 1;

have to be the same as

Memory.myGlobals.stuff = 1

While in python I would play with a metclass overriding the attribute accessing of the targeted class to re-route any of its attribute request towards Memory.myGlobals, In JS I just can't figure it out !

I tried to grasp the getters and setters, but it only applies on one property, not just any...

I made something else, but the way it is used is... well, not as convenient as what I want to acheive.

In pseudo-code, the core of the idea should give that

Memory.myGlobals = {};

function Alias(){
    this.__classAttributGetter__ = function(attributeName){
        return Memory.myGlobals[attributeName];};
}

alias = new Alias();
alias.stuff = [];
alias.stuff.push(1);

SO, would you know how to do this ?