Why doesn't array.push() work when looping object?

Question

I'm doing a simple Sudoku solver with JavaScript, and there is one problem with adding new values to array. My script makes random length arrays in for..in loop. I have tested this script with Chrome Debugger, and there I see that it loops right count. Did I missed some important point of JS objects, or is the .push() wrong way to do this kind of thing?

this.areaSize = gridSideSize * gridSideSize;

//On progress -data structures
this.structures = 
{ 
    rows: new Array(),
    columns: new Array(),
    parents: new Array()
};

//Fill the data structures with the area object
for(var struct in this.structures)
{
    for(var a = 0; a < this.areaSize; a++)
    {
        var tmp = new PartialArea(this.areaSize);
        this.structures[struct].push(tmp);
    }
    console.log(struct.length);
}

Console tells me, that the first array is 4 items long and the second and the third one are 7 items long.

Just log `struct` instead of `struct.length`. You’ll notice your error immediately. — Sebastian Simon, Oct 19 '16 at 23:43

score 1 · Accepted Answer · answered Oct 19 '16 at 23:45

1

struct are the property names rows (which is a string of length 4), columns (7) and parents (7).

Logging this.structures[struct].length would give the expected results.

answered Oct 19 '16 at 23:45

Sebastian Simon

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Why doesn't array.push() work when looping object?

1 Answers1