Array manipulation problem

i have a strange problem , i cannot access to the second table or get the elements of it , i can just show the elements to the user but i cannot do any modification , the first array works fine and the fanny thing is thay have the same code ! can u help me !!

Try to transform in array, passing values like this…

        var arr3 = Object.keys(this.imgs)
            .map(key => (
                    {type: key, value: this.imgs[key]}
        this.imgsArray = arr3;