Applying Curves in a row!

[confile]

I want to apply curves multiple times. What is the correct way of doing this:

1:

 this.curves('rgb', [0, 0], [55, 43], [149, 177], [255, 255]);
this.curves('rgb', [0, 0], [55, 43], [140, 196], [255, 255]);

2:

 this.curves('rgb', [0, 0], [55, 43], [149, 177], [255, 255]);
        this.newLayer(function () {

            this.filter.curves('rgb', [0, 0], [55, 43], [140, 196], [255, 255]);

        }); 

3.

 this.curves('rgb', [0, 0], [55, 43], [149, 177], [255, 255]);
        this.newLayer(function () {
        this.copyParent();
            this.filter.curves('rgb', [0, 0], [55, 43], [140, 196], [255, 255]);

        }); 

[meltingice]

The first method is correct. Filters are applied to the image in the order that they are called, and they can be called any number of times.

[confile]

@meltingice I tested all variants and it turns out that the effect is stronger on variante 2,3