gistfile1.js

    key: function(e) {
        switch(e.charCode || e.keyCode) {
            case 74: case 106: matrix.moveLeft(); break; // J
            case 76: case 108: matrix.moveRight(); break; // L
            case 75: case 107: matrix.moveDown(); break; // K
            case 73: case 105: matrix.rotate(); break; // I
        }
        return false;
    },