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Save instance of array "undo" and copy it back to array.

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Is there a way to get javascript tell how much space an array take up in memory?
If not, how would one go on calculate it?

I was thinking saving one or a few old instances of an array, creating an undo functionality. Could someone show the principle for that using a plain integer array.

This is my array and its attributes.

function autoNodes() {
    for (var m = 0; m < nodes; m++) {
        arr[m] = {
            nodelinks: [],
            hold: false,
            rposX: 0,
            rposY: 0,
            rwidth: 10,
            rheigth: 10,
            rcolor: "red",
            bcolor: "green",
            print: true
        };
     }
}

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Save instance of array "undo" and copy it back to array. jonas.thornvall@gmail.com - 2017-03-17 02:00 -0700
  Re: Save instance of array "undo" and copy it back to array. JJ <jj4public@vfemail.net> - 2017-03-18 18:53 +0700
    Re: Save instance of array "undo" and copy it back to array. Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-03-18 15:01 +0100

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