how to select with intersection?

r-bin  schrieb fredericm80874937 No intersection is done, new selection replaces the existing one. And what result did you expect?

I think something like that

// https://forums.adobe.com/thread/2513858
// how to select with intersection?
// regards pixxxelschubser
var originalRulerUnits = app.preferences.rulerUnits;
app.preferences.rulerUnits = Units.PIXELS;
var aDoc = app.documents.add (400,400);
var myColor = new SolidColor();
var Rd = myColor.rgb.red = 0;
var Gr = myColor.rgb.green = 255;
var Bl = myColor.rgb.blue = 0;
aDoc.selection.select([[150, 150], [150, 350], [350, 350], [350, 150] ]); // add
aDoc.selection.fill(myColor);
refresh();
alert("selection 1 filled");
var Rd = myColor.rgb.red = 255;
var Gr = myColor.rgb.green = 0;
var Bl = myColor.rgb.blue = 0;
aDoc.selection.select([[50, 50], [50, 250], [250, 250], [250, 50] ]); // replace by default
aDoc.selection.fill(myColor);
refresh();
alert("selection 2 filled");
var Rd = myColor.rgb.red = 0;
var Gr = myColor.rgb.green = 0;
var Bl = myColor.rgb.blue = 255;
aDoc.selection.select([[100, 100], [100, 400], [400, 400], [400, 100] ], SelectionType.INTERSECT);
aDoc.selection.fill(myColor);
alert("a new larger selection intersect with previous selection");
app.preferences.rulerUnits = originalRulerUnits;

But this is also a shot into dark.