javascript - How to get a subselection of a D3.js selection -

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I'm trying to get a sub-selection of a given D3.js selection.

Creates the code path: 

  pieces.paths = pieces.groups .append ("path") .attr ("fill", function (d) {return d .data.color;});

Then, I set the D "D" attribute: 

  pieces. Penetration .attr ("d", arc);

To do the right thing but pieces. There are 3 elements in the pith, and I want to set the first two elements in the class "highest". How can I do this?

is an option: 

  pieces. Filter (function (D, i) {returns i <2;}) .attr ("class", "supreme");

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