Question

I have the following struct (or class?) in JavaScript:

function ImageStruct() {
    this.id = -1;
    this.isCover = true;
    this.isPaired = false;
    this.row = -1;
    this.column = -1;
} 

I add this class to a bidimensional array.

var imgStruct = new ImageStruct();
imgStruct.id = id;
imgStruct.row = row;
imgStruct.column = column;

$.myNameSpace.matrixPos[row][column] = imgStruct;

When I do something like this:

var imgStrc = $.myNameSpace.matrixPos[row][column];

If I modify imgStrc, object in $.myNameSpace.matrixPos[row][column] doesn’t reflect that changes.

Is there any way to ‘fix’ this?

Answer 1

If you modify imgStrc it by changing its properties (e.g. by doing imgStrc.id = 42), that change will affect the object in $.myNameSpace.matrixPos[row][column] (as it is in fact the same object).

Only if you modify imgStrc by reassigning it, it won’t. There is no way to ‘fix’ this, other than setting $.myNameSpace.matrixPos[row][column] = imgStrc or wrapping the whole thing into a wrapper object (or one-element array).